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Front. Psychiatry, 22 February 2021 |

Inventory and Analysis of Controlled Trials of Mobile Phone Applications Targeting Substance Use Disorders: A Systematic Review

Rubaab Bahadoor1,2, Jean-Marc Alexandre1,2,3, Lucie Fournet1,2,3, Thibaut Gellé1,2,3, Fuschia Serre1,2,3 and Marc Auriacombe1,2,3,4*
  • 1University of Bordeaux, Bordeaux, France
  • 2Addiction Team Phenomenology and Determinants of Appetitive Behaviors, Sanpsy CNRS USR 3413, Bordeaux, France
  • 3Pôle Addictologie et Filière Régionale, CH Charles Perrens and CHU de Bordeaux, Bordeaux, France
  • 4Department of Psychiatry, Center for Studies of Addiction, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States

Background: Less than 20% of people with addictions have access to adequate treatment. Mobile health could improve access to care. No systematic review evaluates effectiveness of mobile health applications for addiction.

Objectives: First aim was to describe controlled trials evaluating the effectiveness of smartphone applications targeting substance use disorders and addictive behaviors. Secondly, we aimed to understand how the application produced changes in behavior and craving management.

Method: A systematic review based on PRISMA recommendations was conducted on MEDLINE, CENTRAL, and PsycINFO. Studies had to be controlled trials concerning addictive disorders (substance/behavior), mobile application-based interventions, assessing effectiveness or impact of those applications upon use, published after 2008. Relevant information was systematically screened for synthesis. Quality and risk of bias were evaluated with JADAD score.

Results: Search strategy retrieved 22 articles (2014-2019) corresponding to 22 applications targeting tobacco, alcohol, other substances and binge eating disorder. Control groups had access to usual treatments or a placebo-application or no treatment. Eight applications showed reduced use. Most of the applications informed about risks of use and suggestions for monitoring use. Twelve applications managed craving.

Discussion: Heterogeneity limited study comparisons. Duration of studies was too short to predict sustainable results. A reduction of craving seemed related to a reduction in use.

Conclusion: There is a lack of robust and comparable studies on mHealth applications for addiction treatment. Such applications could become significant contributors in clinical practice in the future so longer-termed double-blind studies are needed. Targeting craving to prevent relapse should be systematic.


Substance use disorder (SUD) and behavioral addiction are a major public health concern affecting 10–15% of the world population (1). Regarding legal and illegal substance use, worldwide prevalence has remained globally stable over the last few years. Even though European countries have the highest prevalence of alcohol and tobacco consumption, a decrease has been observed over the past decade (2, 3). However, global health burden remains substantial. Beyond significant costs in health care, SUD human cost is alarming: more than 7 million deaths per year for tobacco, more than 3 million for alcohol and 450,000 for other substances (35).

Addiction is a chronic disorder which persists beyond abstinence. More than withdrawal symptoms, craving is considered to be a major contributor to repeated relapses (69). Craving is listed as one of the core diagnostic criteria in the DSM 5, placing it as a main symptom of addiction and a legitimate target for treatment (10). Despite addiction being a severe condition, it is estimated that overall less than 20% of people with an addictive disorder have access to adequate treatment and this is true across countries (4, 11, 12).

Mobile health (mHealth) may help to reduce this “treatment gap” by improving early diagnosis and access to treatment (11, 12). It has been defined by the World Health Organization as any medical intervention based on mobile devices (13). With the dissemination of mobile services in developed and developing countries, patients with chronic diseases are particularly concerned worldwide. These technologies represent a considerable opportunity to access people in need of medical help, where and when it can be difficult in practice. mHealth is a means to overcome social and territorial disparities in health (14, 15). The digitalization of healthcare services has improved access to information, professional support and medical assistance due to its asynchronous means of communication that abolishes barriers such as traveling time and costs and schedule conflicts with healthcare professionals (16, 17).

mHealth can also contribute to raise awareness among young substance users who consider themselves in good health, while this population is very much affected by risky behaviors (1820). In France, only 12% of teenagers have never experienced tobacco, alcohol or cannabis; revealing a high accessibility of these substances (21) and this is true also in Europe, North America, and Australia (2224). Smartphones, as an autonomous tool, may be a promising new direction to improve the commitment of young adults to care and improving self-efficacy and empowerment (25).

In clinical practice, health applications may offer a complementary approach to usual direct contact care. The combined application of cognitive behavioral therapy (CBT) with smartphone applications could increase access to effective interventions (26). Immediate intervention through these applications can enhance therapeutic effectiveness, consolidate and maintain behavioral change on a long-term basis (27), thus, helping the patient to be independent without being isolated from professional support.

While more than 300,000 health applications currently exist (28), including hundreds of “cessation support” applications, few of them have been clinically tested before being put on the market (17, 29). The majority of these applications have no proof of validity (3032). Some applications even encourage substance use, implicitly or explicitly (29, 30, 33). Yet, studies suggest that mobile applications can positively influence our health behavior (34, 35). Some web-based or instant messaging interventions have demonstrated short- to mid-term effectiveness in reducing use (36, 37). To date, no systematic review has evaluated the effectiveness of mobile applications for the treatment of addictive disorders (32, 33, 38). The aim of this literature review was to identify and describe controlled treatment trials on mobile health applications which support behavior change among users with problematic behaviors or substance uses by the reduction of use or abstinence. Secondly, we aimed to understand how the application produced changes in use or behavior and the management of craving.


Review Protocol

This systematic literature review was based on the ≪ Preferred Reporting Items for Systematic Reviews and Meta-analyses ≫ (PRISMA) recommendations (39).

Information Source and Search

Keywords were defined around 4 criteria (mobile applications, use disorder, effectiveness, excluding web-based interventions) and linked by Boolean operators to generate the following MESH equation: ((smartphone app*OR mobile app*)) AND ((substance use disorder OR addict* OR addictive behavior OR cessation OR recovery OR craving OR alcohol OR smok* OR tobacco OR cannabis OR marijuana OR heroin OR cocaine OR opioid OR gambl* OR binge eating OR porn)) AND ((efficacy OR effectiveness OR impact OR validity)) NOT ((web-based intervention OR Internet)).

Literature searches were performed using MEDLINE, Cochrane central register of controlled trial (CENTRAL) and PsycINFO, up to 1st July 2019 (Table 1).


Table 1. MESH terms used for database searching.

Eligibility Criteria and Study Selection

Studies were included if they met the following criteria: controlled trials concerning addictive disorders (substance/behavior), mobile application-based interventions, assessing the effectiveness or impact of those applications upon use. Addictive behaviors already added in DSM-5 (pathological gambling) or to be considered for further revisions because of important clinical data and research progress [binge eating, pornography (40)] were considered in this review. The research was limited to English and French articles that were published after 2008 which corresponds to the year of first release of health applications.

Age, sex, or nationality of the sample population were not included in the selection criteria. Articles doing a descriptive review of mobile applications, study protocols with no results on efficacy, and literature reviews were excluded.

The articles were first screened by their title and abstract. If relevant, full-text articles were read entirely for a second level selection. Database access and reference management were done by Endnote X6 software.

Data Collection Process and Synthesis

Each selected paper was screened for relevant information such as whether the application treated one or more addictions, its functionalities, the target population, the randomization, the characteristics of the control group(s) and the results on use and/or craving. The quality of the study and risk of bias was evaluated by the JADAD score (41); a good methodological quality was defined by a score above 3/5.


Study Selection

The initial search found 1,713 articles. After screening by titles and abstracts, 34 articles were retained and thoroughly reviewed. Twenty-two controlled studies met our eligibility criteria. The selection steps are shown in Figure 1. The 22 selected articles concerned 22 applications (Table 2) focused on: tobacco (12 articles) (25, 4252), alcohol (8 articles) (5357, 59, 60), other substances (1 article) (61), and binge eating disorder (BED) (1 article) (62). The “A-CHESS” and “SmartQuit” (version 1.0 and 2.1) applications were each studied by two different teams (44, 56). One study evaluated two alcohol cessation applications (“Promillekoll” and “PartyPlanner”) (58). No application was dedicated to multiple addictions.


Figure 1. PRISMA flowchart.


Table 2. List of applications identified by the systematic review.

The majority of studies were published since 2017 (n = 18) and a minority (n = 4) in 2014 and 2015, no studies were published before. The detailed analysis of each study is presented in Tables 35. A total of 39,031 participants were included in the studies (tobacco: 34,174; alcohol: 4,716; other substances than alcohol and tobacco: 75; BED: 66) whose duration ranged from 1 to 12 months (average 5 months). The studies were conducted in 11 different countries (Table 3). Two studies included participants aged 16 and over (51, 60) and the other studies included adults.


Table 3. Characteristics of controlled trials (ranged by addictive disorder).


Table 4. Characteristics of interventional and control groups (ranged by addictive disorder).


Table 5. Bias risk assessment- JADAD score (ranged by addictive disorder).

Tobacco Addiction Applications

Characteristics of Studies

One study targeted users aged 19–29 years (25). One application was specifically intended to support pregnant women (52) and another one for aboriginal Australian population (51). The level of severity of addiction varied between studies. Two studies included people with high severity (Heaviness smoking index (HSI) > 5, Fagerström> 7) (43, 46) and two others, with medium severity (his = 3, Fagerström = 5) (44, 52).

One application was compared to a self-help guide with similar contents to the application (25), three applications were compared to group therapy or brief intervention (44, 48, 49) and two other control groups did not have access to any intervention (46, 51). Other studies compared the active application to a placebo version of the application, mainly for informational or monitoring purposes [(42, 43, 45, 47, 50, 52); Tables 3, 4].

Effectiveness of Applications

The evaluation criteria of the studies were self-reported abstinence (25, 42, 43, 45, 46, 48, 50, 52) or biologically verified abstinence (expired /urinary level of carbon monoxide (CO)) (44, 47, 49, 51) or self-reported reduction in use (46, 52).

The rate of abstinence for the “Quit Advisor Plus” application was at 28.5% at 1 month compared to 10.2% at 6-month follow-up. Nevertheless, the overall quit rate for “Quit Advisor Plus” and for the remaining 2,214 participants of “SmokeFree,” who had variable nicotine dependence levels, was significantly higher compared to the placebo application, at 6 and 3 months, respectively. The “SmokeBeat” application (46) showed a significant reduction, at 1 month, in the number of cigarettes per day, among adult smokers with severe addiction (Fagerström score: 12.50 and 19.95 for interventional group and control group, respectively). Five other applications did not show a sustained reduction in tobacco use (25, 44, 47, 49, 52). The other studies did not specify the reduction of use [(42, 43, 45, 48, 50, 51); Table 3].

Functionalities of Applications

The main functions of the applications were information on the risks of tobacco use, the benefits of abstinence, the different modes of cessation and monitoring of tobacco use, financial savings and health gains due to quitting. Some applications had special features, such as personalization of data (4244, 50), the particular modes of detecting tobacco use (46, 49) or specific craving management techniques [(4345, 47, 48); Table 4].

Impact of Interventions on Craving

Among the eight applications which managed craving (25, 43, 44, 47, 48, 50, 51, 54), three of them (43, 47, 48) evaluated the effectiveness of the intervention on this symptom. Unlike “PhoS” (48), “SmartQuit 1.0” (43) showed a positive impact on craving with a higher quit rate and “Craving to Quit” (47), a reduction in craving intensity as well as a decrease in the association between craving and tobacco use (Table 3).

Methodological Quality of Studies—Risk of Bias

Two studies had low methodological quality (JADAD score <3) (46, 49) due to a non-optimal randomization (46) or the lack of description of randomization and double-blinding (49). Five studies were single-blinded [(4446, 50, 52); Table 5].

Alcohol Addiction Applications

Characteristics of Studies

Three studies aimed University students (57, 58) or users aged 16–25 years (60) engaged in hazardous drinking [Alcohol Use Disorder Test (AUDIT) score >6 for women, >8 for men, >4 drinks per event] (57, 60). Other studies included users with alcohol use disorder (AUD) according to the DSM IV (55, 56) and 5 (59) criteria or AUDIT score >12 (53, 54). Two studies recruited patients with AUD who were discharged from residential treatment programs (55, 56).

Two applications were compared to the usual CBT program or brief intervention (55, 56, 59), and one application was compared to a placebo version which was non-customizable and for information purposes only (54). One control group had delayed access, at 1 month, to the application (60) and three others had no intervention [(55, 56, 59); Tables 3, 4].

Effectiveness of Applications

The main outcome was alcohol reduction in quantity and/or frequency, either self-reported (5357, 59) or evaluated by the AUDIT score and/or the daily drinking questionnaire (DDQ) (54, 57, 58, 60). Complete alcohol cessation was sought in three studies (55, 56, 59).

Three studies, concerning the two applications “A-CHESS” (55, 56) and “LBMI-A” (59) found a significant reduction in use as well as an increase in abstinence, among patients who were diagnosed with AUD, at 12 months and 6 weeks, respectively. Using “A-CHES” application was also positively correlated with a better adherence to outpatient addiction treatment. A positive correlation between the use of “A-CHESS” and the decrease in risky drinking days was found (55). The “TeleCoach” (57) application showed a significant decrease in the frequency of use, without any impact on the quantity, at 3-month follow-up while “Ray's Night Out” (60) showed a reduction in the quantity of alcohol use only at 1 month assessment. The “Promillekoll” application that estimated the blood alcohol concentration (BAC), showed a higher frequency of alcohol use (58). Compared to the control group, no change in drinking behavior were reported in the other studies [(53, 54, 58); Table 3].

Functionalities of the Applications

Most of the applications informed about the consequences of risky drinking and monitored the number of drinks. Three applications estimated the BAC (53, 58). One application used cognitive bias retraining by alcohol eviction games to review the user's approach to alcohol use (54). Three applications prevented situations of high risk of relapse by identifying craving in real time (5557, 59). The self-determination theory which aimed at developing competency, relatedness, and autonomy was used in one application [(55, 56); Table 4].

Impact of Interventions on Craving

Although three applications managed craving, the effectiveness on its reduction was not sought in the corresponding studies: “A-CHESS” (55, 56), “LBMI-A” (59), and “TeleCoach” [(57); Table 3].

Methodological Quality of Studies—Risk of Bias

Five studies were of good methodological quality (JADAD score > 3) (5558, 60). One study was not randomized (59). None of the studies were double-blinded (Table 5).

Other Substances Addiction Application

Characteristics of Study

Only one study concerning the “S-Health” application was identified (61). The participants were users of other substances (ex: heroin, amphetamines.) in methadone treatment for opioid addiction (Tables 3, 4).

The control group had access to a placebo version of the application that only provided information on use by instant messages.

Effectiveness of Application

The number of days of use was self-reported daily and a multi-drug urine test was performed weekly by a clinician. A significant decrease in the number of days of use was observed in the interventional group. However, the positivity of the urine test was not statistically different between the two groups (Table 3).

Functionalities of the Application

Multiple surveys were conducted daily, systematically or upon request, about the context and personal state in which craving occurred, its expression and subject's response. The application also informed about reduction of HIV risk behavior and provided educational materials by text messages (Table 4).

Impact of Interventions on Craving

Even if the application dealt with craving, the impact of the intervention on this symptom was not sought, only substance use was reported (Table 3).

Methodological Quality of Study—Risk of Bias

This study had a low methodological quality (JADAD score = 1). The method of randomization was incorrect as the distribution of participants between the two groups was uneven. The study was not conducted in double-blind condition (Table 5).

Binge Eating Addiction Application

Characteristics of Study

Only one study concerning the “Noom monitor” application was found (62). Participants were eligible if they met the diagnostic criteria of bulimia nervosa or binge eating disorder according to the DSM 5 or DSM IV with once weekly binge eating and/or purging.

The combined use of the application to behavioral cognitive therapy (BCT) was compared to BCT alone (Tables 3, 4).

Effectiveness of Application

The change in eating disorder behavior, with or without compensatory behaviors was evaluated by the Eating Disorder Examination Questionnaire (EDE-Q). No significant difference was found in the decrease of binge eating episodes or compensatory behaviors in both arms (Table 3).

Functionalities of the Application

The application served as a self-monitoring tool to record activities (physical exercises, meals/snacks, compensatory behaviors, craving, weight, personal notes; Table 4).

Impact of Interventions on Craving

The effect of the intervention on craving was not evaluated in this study (Table 3).

Methodological Quality of Study—Risk of Bias

This double-blind study had a good methodological quality [JADAD score = 3; (Table 5)].


Synthesis of the Main Results

The aim of this systematic review of the literature was to identify and describe published controlled trials concerning health applications which support addiction behavior change among problem users, to substance or behavior addictions. We identified 22 trials regarding 22 applications. Each application targeted a unique addiction: tobacco, alcohol, other substances, and binge eating. The results of this review suggest that very few of these applications have shown compelling evidences of their efficacy upon abstinence or reduction of use or craving.

Critical Analysis of Effective Applications

A total of 8 applications reported results supporting effectiveness (3 for tobacco, 4 for alcohol, and 1 for other substances use). Among the smoking addiction applications, “Quit Advisor Plus” (42), “SmokeFree” (45), and “SmokeBeat” (46) showed significant change in use behavior compared to controls, at 6, 3, and 1 month, respectively. Even if the rate of abstinence was higher for “Quit Advisor Plus,” a constant decline in quit rates was observed throughout the study. The number of abstinent participants was, numerically, half as important at 6-month follow-up which implies that more than half of them relapsed (42). The two other studies had important attrition bias (45, 46). The retention rates were extremely low (7.5%) for “SmokeFree,” despite massive recruitment, leading to inequalities between the characteristics of the study arms (45). Disparities were also found for “SmokeBeat” (46), where the control group had a higher tobacco addiction level due to error in randomization, which could, partially, explain the lack of effectiveness of the intervention in this group. Both “SmokeFree” (45) and “SmokeBeat” (46) were conducted over a too short duration to predict sustainable results on efficacy. Furthermore, no sub-group analysis was made to determine which level of severity of addiction could be more receptive to this type of intervention.

For applications which treated AUD, “A-CHESS” was positively correlated with improvement of use behavior among diagnosed patients, during aftercare, over 12 months. Findings in both studies were consistent. A better compliance to treatment was found in the intervention group. “A-CHESS” was the only application whose study was conducted during aftercare which represents a crucial moment for therapeutic adherence (55, 56). The impact of this application could be explained by the mechanism of behavior change based on self-efficacy and the fact that patients were encouraged to be proactive in their care by seeking social support in critical moments. The long study duration supports the effects of the intervention on a long-time basis.

The efficacy of “LBMI-A” (59), “TeleCoach” (57), and “Ray's Night Out” (60) was less convincing. The poor methodological quality, the short study duration as well as the lack of statistical power for “LBMI-A” impaired the quality of the study and did not allow relevant conclusions to be drawn (59). As for “TeleCoach” (57), the exclusive decrease in the frequency of use has no clinical value. The reduction in the quantity of use for “Ray's Night Out” (60), only at 1 month, was attributed, by the authors, to an assessment effect where an unconscious change in habits of use might occur at inclusion. No plausible argument supports the effect of those applications on behavior change.

For other substances, “S-Health” tested on patients with opioid use disorders showed a positive impact on the reduction of use (61). However, biological verification did not correlate these results at 1-month assessment. This could be in part explained by the detection method and the duration of the study. Change in use behavior could also have been overestimated by memory bias due to retrospective self-report of use and randomization bias.

Critical Analysis of Ineffective Applications

Fourteen applications [9 for tobacco (25, 43, 44, 4752), 4 for alcohol (53, 54, 58), and 1 for BED (62)] were considered to be ineffective. However, “Crush the crave” targeting smoking, which did not show greater efficacy than the manual guide, had a high quit rate (230/1599). Also, 30 more participants smoked less than one pack per day while using the application (25). Several factors may have influenced these results such as the frequency of use (higher for the guide) or the on-demand solicitation of the application which may be perceived as a burden by the user. The clinical impact of these findings is substantial. Moreover, the mechanism of delivery being different, the mobile application can be more easily disseminated than a paper booklet.

The use of BAC in the 'Promillekoll' application showed an unexplained increase in alcohol use (58). The calculation of BAC so as to limit use, in various studies, has not been proven effective (53, 58, 60).

Several biases have been identified in the other trials making the results on efficacy difficult to interpret, such as confusion factors with the control groups (44, 48, 54, 62) or attrition bias (44, 46, 54) between the two arms, the short study duration (less than 6 months) (43, 45, 46, 49, 52, 54, 5759, 61) or the low statistical power of some trials (43, 44, 46, 48, 51, 57, 5962) which lead to an under-estimation of the results.

Craving Management

Twelve applications managed craving. “A-CHESS,” which showed probative results on change in use, specifically monitored craving and proposed real-time solutions to manage this symptom (55, 56). Even if, “Craving to Quit” (47) and “SmartQuit” (43) did not show significant effect on use, their craving management techniques seemed effective, on the short-term, on the intensity of craving, the association of craving and use or a better acceptance of the symptom which was correlated to a higher prevalence of abstinence. The lack of impact of physical activities on craving for the “PhoS” application could be explained by the fact that both study arms received information on the benefits of physical activities prior to the test (confusion factor) (48).

The other applications did not systematically evaluate the impact of the interventions on craving which made it difficult to determine whether the craving management techniques, used in those applications, are really effective.

Validity of Results

Two applications (out of 8) which were considered effective by the authors had poor methodological quality (46, 59) due to inappropriate randomization. The JADAD score, used in this review, had certain limits. Double-blinding was not always possible between the study groups due to heterogeneous comparators (e.g., application compared to a paper booklet or no intervention). Some information could have been omitted by authors due to volume restriction of journals. Applications which are considered effective in one population, in a particular country should be tested in other contexts before any conclusion can be made on generalizability.

Prospects of Improvement for Applications

More randomized controlled trials (RCTs) are required over a sufficiently longer period, minimum 12 months, and on a larger scale to be able to predict sustainable results. Information and monitoring are important features of health applications, however, the active involvement of the user (e.g., by daily tasks) could be more effective in enhancing the effects of the intervention. Mobile health interventions should continue to target the psychological mechanisms implied in behavior change, such as self-efficacy. A more systematic consideration of craving by the applications should be considered. The lack of support for craving might explain the failure to maintain change in behavior observed for some applications (42, 54, 57). The impact of these interventions must be measured in different contexts (with or without treatment, on different severity of addiction, in various sociodemographic contexts) to better understand their limitations and the profile of patients who could be more receptive to this type of intervention.


Some limitations of this review are to be acknowledged. First, searches were led in only three databases. Every effort was made to ensure that this review of the literature was comprehensive and encompassed all available and relevant literature however. Articles published elsewhere will not have been considered, however, we searched comprehensive databases for articles with the best methodological qualities. Articles not published in English or French language would have been missed by the search methodology. Secondly, selected applications are recent and further studies on their impact are in progress. Thirteen trials concerning addiction recovery applications have been identified in the Clinical Trial database (Table 6). This systematic review highlights the current state of knowledge among heterogeneous data and questions remaining to be investigated.


Table 6. Studies in progress or waiting for publication on Clinical Trial.


The current findings suggest that smartphone applications can effectively contribute to behavior change and craving management in SUDs and addictive disorders. However, to date, very few applications have been evaluated for validity. The evidence on the efficacy of mHealth addiction recovery applications are too limited at this time to be able to recommend them as an autonomous or complementary tool for the treatment of addictions. However, there is a signal that such applications could become significant contributors to treatment in the future. For that more rigorous RCTs including more homogeneous comparators are required, on larger scale and with longer-term evaluations so as to clarify the sustainability of the change in use behavior. Real-time interventions have immediate impact on behavior change. However, the long-term challenge is the prevention of relapse through the management of craving and global care. In that perspective, further research on mHealth is needed.

Data Availability Statement

The original contributions presented in the study are included in the article/supplementary material, further inquiries can be directed to the corresponding author/s.

Author Contributions

MA was the overall principal investigator of the study. RB and MA developed the review protocol and information search, and drafted the manuscript. RB, LF, and TG performed literature search, selected articles, and extracted information. J-MA and FS provided methodological support, critical revision, and editing of the manuscript. All authors significantly contributed to the manuscript and approved the final version.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.


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Keywords: substance use disorder, mHealth, efficacy, mobile applications, systematic review

Citation: Bahadoor R, Alexandre J-M, Fournet L, Gellé T, Serre F and Auriacombe M (2021) Inventory and Analysis of Controlled Trials of Mobile Phone Applications Targeting Substance Use Disorders: A Systematic Review. Front. Psychiatry 12:622394. doi: 10.3389/fpsyt.2021.622394

Received: 28 October 2020; Accepted: 27 January 2021;
Published: 22 February 2021.

Edited by:

Stephanie Carreiro, University of Massachusetts Medical School, United States

Reviewed by:

Marc Rigatti, UMass Memorial Medical Center, United States
Charlotte Goldfine, Brigham and Women's Hospital and Harvard Medical School, United States

Copyright © 2021 Bahadoor, Alexandre, Fournet, Gellé, Serre and Auriacombe. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Marc Auriacombe,