Original Research ARTICLE
Unmet support service needs and health-related quality of life among adolescents and young adults with cancer: the AYA HOPE study
- 1Outcomes Research Branch, Applied Research Program, Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, MD, USA
- 2Department of Epidemiology and Biostatistics, School of Medicine, The University of Texas Health Science Center, San Antonio, TX, USA
- 3Human Development and Family Studies, University of Connecticut, Storrs, CT, USA
- 4University of Michigan School of Social Work, Ann Arbor, MI, USA
- 5Information Management Services, Rockville, MD, USA
- 6Department of Epidemiology, The University of Iowa, Iowa City, IA, USA
- 7Children’s Hospital of Michigan, Detroit, MI, USA
- 8Cancer Prevention Institute of California, Fremont, CA, USA
Introduction: Cancer for adolescents and young adults (AYA) differs from younger and older patients; AYA face medical challenges while navigating social and developmental transitions. Research suggests that these patients are under or inadequately served by current support services, which may affect health-related quality of life (HRQOL).
Methods: We examined unmet service needs and HRQOL in the National Cancer Institute’s Adolescent and Young Adult Health Outcomes and Patient Experience (AYA HOPE) study, a population-based cohort (n = 484), age 15–39, diagnosed with cancer 6–14 months prior, in 2007–2009. Unmet service needs were psychosocial, physical, spiritual, and financial services where respondents endorsed that they needed, but did not receive, a listed service. Linear regression models tested associations between any or specific unmet service needs and HRQOL, adjusting for demographic, medical, and health insurance variables.
Results: Over one-third of respondents reported at least one unmet service need. The most common were financial (16%), mental health (15%), and support group (14%) services. Adjusted models showed that having any unmet service need was associated with worse overall HRQOL, fatigue, physical, emotional, social, and school/work functioning, and mental health (p’s < 0.0001). Specific unmet services were related to particular outcomes [e.g., needing pain management was associated with worse overall HRQOL, physical and social functioning (p’s < 0.001)]. Needing mental health services had the best associations with worse HRQOL outcomes; needing physical/occupational therapy was most consistently associated with poorer functioning across domains.
Discussion: Unmet service needs in AYAs recently diagnosed with cancer are associated with worse HRQOL. Research should examine developmentally appropriate, relevant practices to improve access to services demonstrated to adversely impact HRQOL, particularly physical therapy and mental health services.
Advances in the diagnosis and treatment of cancer have increased the possibility of survival for many cancer patients. With nearly 69,200 adolescents and young adults (AYA) aged 15–39 diagnosed annually with cancer in the United States (National Cancer Institute, 2011), meeting survivorship care needs remains critical and understudied. Research on AYAs with cancer suggests that this population faces unique psychosocial and developmental needs when handling their healthcare. This is complicated by the fact that they encounter multiple social, emotional, and logistical challenges while simultaneously taking on new roles of responsibility and independence (Albritton and Bleyer, 2003; Fernandez and Barr, 2006; Zebrack, 2008). Unfortunately, there is also evidence that AYAs with cancer are under or inadequately served by existing support services (Zebrack et al., 2009, 2013; Dyson et al., 2012; Hall et al., 2012; Keegan et al., 2012).
Our study team previously found that 56 to 75% of AYA cancer survivors enrolled in the Adolescent and Young Adult Health Outcomes and Patient Experience (AYA HOPE) study who needed specific supportive care services including support group, pain management, physical or occupational therapy, mental health services, or financial advice on paying for health care did not receive these services (Keegan et al., 2012). Further, AYAs who were not currently in treatment (80%), reported that their physical health or emotional problems interfered with their social activities (a measure from the general health subdomain of the SF-12®) or had three or more physical symptoms were more likely to have an unmet service need (Keegan et al., 2012). In addition to a gap in support services, AYA cancer survivors have poorer cancer outcomes compared with pediatric and older adult patients (Stava et al., 2006), including poor health-related quality of life (HRQOL) (Zebrack et al., 2009; Clinton-McHarg et al., 2010; Smith et al., in press). Our study team additionally found that AYA cancer survivors exhibited significantly worse HRQOL across mental and physical health scales compared with the general population (Smith et al., in press). Survivors who were undergoing treatment, reporting current or recent symptoms, or lacking health insurance at any time since diagnosis were more likely to report worse HRQOL (Smith et al., in press). Though one Australian cohort study (Hall et al., 2012) has shown deficits in service and information needs as well as reduced HRQOL in AYAs with cancer, to date no studies have examined associations between service needs and HRQOL.
The current paper uses one of the largest population-based cohorts of AYAs diagnosed with cancer in the United States to examine relationships between unmet service needs across a variety of HRQOL domains including physical, emotional, spiritual, work/school, and financial outcomes. One of the main goals of the AYA HOPE study was to examine the impact of the cancer experience on health and psychosocial outcomes and to inform the development of future studies that focus on care and outcomes of AYAs. In the current study, we specifically examined relationships between any unmet service need and HRQOL as well as each individual unmet service need and HRQOL. This information will provide evidence to help understand the impact of unmet service needs on important health outcomes in the growing population of AYA cancer survivors.
Materials and Methods
Details regarding AYA HOPE recruitment and study methods have been published previously (Harlan et al., 2011; Keegan et al., 2012). Briefly, respondents were diagnosed with a histologically confirmed non-Hodgkin lymphoma (NHL) (n = 121); Hodgkin lymphoma (n = 135); germ cell cancer (n = 193); acute lymphoblastic leukemia (ALL) (n = 16), or sarcoma (Ewing’s, osteosarcoma or rhabdomyosarcoma) (n = 19) between July 2007 and August 2009. Participants were age 15–39 years old at diagnosis, 6–14 months post-diagnosis at study entry, and able to read and write in English. Participants were recruited from one of seven National Cancer Institute (NCI) Surveillance, Epidemiology, and End Results (SEER) registries: Detroit, Seattle/Puget Sound, Los Angeles County, San Francisco/Oakland, Greater California, Iowa, and Louisiana. Study approval was obtained by each of the registries’ and NCI’s Institutional Review Boards. Of the 1,208 patients identified as eligible, 525 patients responded to the study (one respondent only consented to release of medical record data and one survey was lost, leaving 523 surveys), and medical records were obtained on 490 respondents. There was a 43% response rate for the overall study (Harlan et al., 2011).
In the AYA HOPE patient survey, respondents were asked questions about their demographic characteristics; barriers to and quality of healthcare; treatment and symptoms; insurance status, information and service needs, the impact of cancer, and HRQOL including psychosocial and physical functioning domains. Please see the following website for the study questions: http://outcomes.cancer.gov/surveys/aya/aya_hope_survey.pdf. The survey took approximately 15–20 min to complete.
We describe the measures relevant to the current study aims below:
Health-related Quality of Life: Two instruments were used to assess physical and psychosocial functioning across the wide age/developmental range in the AYA HOPE study (Smith et al., in press). The PedsQL™ 4.0 was originally developed for use with children and adolescents, with a young adult version designed for individuals up to age 25 (Varni and Limbers, 2009) and validated in young adults with cancer (Ewing et al., 2009). It included the following domains: overall health, physical health summary, psychosocial health summary, emotional functioning, social functioning, and work/school functioning. We also included the PedsQL fatigue module (Varni and Limbers, 2008), given the importance of fatigue specifically for cancer patients. Further, as the PedsQL has only been validated up to age 25, we used the SF-12, version 2 (Ware et al., 2002), to best assess HRQOL outcomes in older young adults. The SF-12 has been validated for use in adults 18 and older and generates two global scores, using weighted subscale scores to compute the physical component summary (PCS) and mental component summary (MCS) scores (Ware et al., 2009).
Service Needs: Service needs included in this study were adapted from questions in a prior study of adult cancer survivors (Arora et al., 2007). Respondents were asked to indicate whether they had received (before, during, or after cancer treatment) the following supportive care services: participating in a support group; seeing a pain management expert; getting professional advice to help figure out payment for healthcare; seeing a physical or occupational therapist for rehabilitation; seeing a psychiatrist, psychologist, social worker, or mental health worker; talking with a spiritual or religious counselor about cancer; or having a nurse come to their home (Keegan et al., 2012). In addition, participants were asked whether they have needed (at the time of survey completion or now) need any of these services. A service need was considered unmet if the respondent did not receive the service, but reported needing the service (Keegan et al., 2012).
Covariates: Demographic data including age, sex, race/ethnicity, education level, and marital status, as well as health insurance (including whether respondents lacked health insurance at any time since diagnosis), and symptoms were collected from the self-report survey. Disease-related variables were obtained from SEER and medical records and included cancer type, AJCC stage, treatment type (surgery alone, radiation, chemotherapy or combined chemotherapy, and radiation), whether participants were receiving treatment at the time of the study, and comorbid conditions. Conditions in the comorbidity index had to be severe and/or chronic (i.e., serious and expected to affect treatment or outcomes or create significant health burden) and were categorized into condition groups and were summed to create final comorbidity scores as 0, 1, >2 based on a previously published comorbidity scale for AYA survivors (Parsons et al., 2012). Based on consultation with AYA oncology clinical experts, we included symptoms common to the cancer types being studied. Participants reported whether they experienced the following symptoms in the past four weeks: nausea/vomiting, frequent/severe stomach pain, diarrhea/constipation, pain in joints/bones, weight loss, weight gain, frequent/severe fevers, hot flashes, tingling/weakness/clumsiness of the hands/feet, frequent/severe headaches, frequent/severe mouth sores that impact eating/drinking, and problems with memory/attention/concentration. The number of symptoms was summed and to be consistent with our previous studies (Keegan et al., 2012; Kent et al., in press; Smith et al., in press). Symptom number was categorized as 0, 1–2, 3–4, or 5+.
To examine associations between unmet service needs and HRQOL outcomes (PedsQL total, physical, emotional, social and work/school functioning scores, and fatigue scores and SF-12 physical and MCS scores), we used hierarchical multiple regression models controlling for factors found to be associated with HRQOL (Smith et al., in press), including age, sex, race/ethnicity, education, marital status, cancer type, stage at diagnosis, health insurance, current treatment status, treatment type, comorbidities, and symptoms. We examined models in which respondents indicated any, as opposed to no unmet service need, similar to other studies (Girgis et al., 2000; Sanson-Fisher et al., 2000; Keegan et al., 2012), as well as separate models with individual unmet service needs [service needs were uncorrelated with one another (all r < 0.50)]. Analyses were conducted using SAS version 9.2 software (SAS Institute Inc., Cary, NC, USA), and due to multiple comparisons, α was set at 0.01. Because 39 participants had missing responses, the analytic sample used in this analysis was n = 484.
Table 1 describes the demographic and clinical characteristics of the study participants. Approximately half of the respondents were 29 years of age or younger at diagnosis. The majority of participants were male, non-Hispanic white, working full time, and unmarried. Most participants had health insurance, but 14% reported lacking insurance at some point since diagnosis. Sixty-five percent of participants were diagnosed with early stage disease (stage I/II) and 82% were not in treatment at the time of study participation. Most participants (84%) had at least one symptom in the 4 weeks prior to completing the survey and 28% had a severe or chronic comorbidity.
More than one-third of AYAs reported at least one unmet service need (n = 172, Tables 2 and 3). The most commonly reported unmet service needs were financial (16%), mental health professional (15%), and support group (14%) services. Regression models showed that after adjusting for relevant demographic and medical covariates, having any (one or more) unmet service need was associated with lower HRQOL on all domains except the SF-12 PCS. Significant associations were found on the PedsQL total score, all PedsQL subscales: fatigue, physical functioning, emotional functioning, social functioning and school/work functioning, and the SF-12 MCS (all p’s < 0.0001; Tables 2 and 3).
Table 3. Multiple linear regression models* examining unmet service needs and SF-12 health-related quality of life summary scores.
Table 2 presents PedsQL outcomes for individual service needs. Results for the Total score (overall HRQOL) showed that having a need for social support groups, mental health services, physical/occupational therapy, or pain management services was associated with worse overall HRQOL (all p’s < 0.0001). AYA cancer survivors who indicated need of a support group (p < 0.0001), mental health professional (p < 0.0001), or physical/occupational therapy (p < 0.01) reported more fatigue than those who did not report those needs. Worse physical functioning was associated with unmet needs related to participation in a support group (p = 0.002) or needs for physical or occupational therapy (p = 0.002), or a pain management expert (p = 0.001). Lower scores on emotional functioning were associated with needing a support group, a mental health professional, a physical or occupational therapist, or to see a spiritual/religious counselor (all p’s < 0.0001). Worse social functioning was associated with needing a support group (p = 0.0001), a mental health professional (p < 0.0001), a physical or occupational therapist (p = 0.002), or pain management services (p = 0.001). Finally, unmet needs associated with worse work/school functioning were associated with needing a support group (p < 0.0001), mental health services (p < 0.0001) or physical/occupational therapy (p = 0.009).
Results for SF-12 outcomes and individual service needs (Table 3) indicated that unmet need regarding physical/occupational therapy or pain management services were associated with worse overall physical health on the PCS (p < 0.01 and p < 0.0001, respectively). On the MCS, our adjusted models indicated that needing a support group, professional mental health services, or needing to see a spiritual/religious counselor, were associated with worse overall mental health (p’s < 0.001).
In our study of recently diagnosed AYA cancer survivors, we found that having unmet service needs was strongly associated with lower HRQOL. Furthermore, we identified high levels of unmet service needs in this population, with 35% (n = 172) of survivors reporting at least one service need (Keegan et al., 2012). Individual service needs ranged from approximately 15% for financial (n = 77) or mental health professional (n = 74) services to 2% (n = 10) for nursing services in the home. Several specific service needs were associated with HRQOL outcomes and even having one unmet service need was associated with decrements in overall HRQOL, physical, emotional, and social functioning, fatigue, and work/school functioning, as well as overall mental health. Specific needs to see a physical or occupational therapist, a mental health professional, a pain management expert, spiritual/religious counselor, or to participate in a support group were all associated with worse HRQOL domains. Needing mental health services had the strongest associations with worse HRQOL outcomes, while the need for physical or occupational therapy was most consistently associated with poorer functioning across HRQOL domains. Overall, this study extends previous research on unmet service needs (Zebrack, 2008; Keegan et al., 2012; Zebrack et al., 2013) and identifies a critical need to increase services for recent AYA cancer survivors as a means for improving both quality of life and functioning during a highly transitional period of life.
A prominent finding of our study was that having unmet needs for mental health professional services had the strongest associations with outcomes (worse: overall HRQOL, overall mental health, fatigue, emotional functioning, social functioning and work/school functioning), consistent with a recent review (Kahalley et al., 2012). Our finding that 15% of AYA survivors have unmet mental health needs is lower than a study of 215 recently diagnosed AYA cancer patients, where unmet mental health needs ranged from 13.4% in 14- to 19-year-olds to 38.5% of 30- to 39-year-olds (Zebrack et al., 2013), but higher than needs in adult cancer survivors nationally (11.7%) (Hewitt and Rowland, 2002). Individuals indicating a need for support groups reported worse HRQOL on the same domains as those having unmet mental health needs, and also on the physical functioning subscale. However, individuals endorsing needs for mental health and those endorsing support group services differed somewhat, as the correlation between these two service needs was modest (r = 0.47; data not shown).Though not surprising that needing mental health services or support groups are associated with worse emotional or social functioning, they are also associated with fatigue and school/work functioning, both of which can have detrimental effects on everyday life activities and adjustment back to normal routines. Studies of pediatric and young adult cancer survivors show that cancer and its treatment have a strong negative impact on work/school (Nagarajan et al., 2003; Parsons et al., 2012); the current study suggests that having better access to mental health support services, or finding ways to increase AYAs’ service utilization, has the potential to partially ameliorate this impact.
While increasing awareness and promoting the use of mental health services to AYA cancer survivors may improve HRQOL, the United States is currently experiencing a severe national shortage of mental health providers, particularly for adolescent psychiatry (Thomas and Holzer, 2006; Masri et al., 2008). Moreover, until recently, mental illness was a criterion that could be used by insurers to deny coverage under the “pre-existing condition” clause (Hyde, 2010). However, under the Affordable Care Act, mental health services will be covered as part of the essential benefits package. As a result, future studies should examine how these policies influence the accessibility and affordability of mental health services for AYA cancer survivors as well as their impact on HRQOL.
Another strong finding in the current paper was that having unmet needs for physical/occupational therapy was associated with poorer outcomes across all HRQOL domains examined except mental health. Though only 9% of the AYA participants in the current study reported unmet physical/occupational therapy service needs, other studies of adults with cancer have reported much a higher prevalence of 30–43% (Thorsen et al., 2011; Holm et al., 2012). Despite a growing appreciation for comprehensive rehabilitation services for cancer survivors (Alfano et al., 2012), physical and occupational therapy utilization rates are likely lower than optimal among AYAs. Young adult survivors of childhood cancers have been found to have low utilization rates of physical therapy and chiropractic use (Montgomery et al., 2011). Future studies should consider the large impact that physical and occupational therapy can have on a variety of health outcomes in AYA, beyond physical functioning.
Our finding that unmet pain management needs were associated with worse overall HRQOL, physical and social functioning are consistent with observations in adult populations. Pain is among the most common cancer symptoms, and a meta-analysis has shown that 33–70% of adult cancer patients report pain symptoms ranging from treatment-related pain to lingering pain in survivorship (Van Den Beuken-Van Everdingen et al., 2007; Valeberg et al., 2008). When pain is unaddressed patients and survivors can experience a negative impact on a range of physical and psychosocial outcomes, such as diminished range of motion and mobility, depressive symptoms, ability to focus, and reduced coping with day to day activities (Institute of Medicine, 2008; Green et al., 2011). While there are estimates that 80–90% of cancer-related pain can be controlled by medication (Stjernsward and Teoh, 1990), barriers limit the ability to identify a need for pain management during cancer treatment or survivorship. Previous research has identified a range of psychosocial barriers that may limit help-seeking related to pain in AYAs such as a fear of addiction to pain medications and concern that social activities may be restricted if pain were reported (Ameringer, 2010). To address some of these concerns, several studies in pediatric and adolescent cancer patients have suggested that complementary and alternative medicine approaches, including acupuncture, meditation, massage, or aromatherapy, may be effective in reducing procedural pain and patient distress (Landier and Tse, 2010). Indeed, Zebrack et al. (2013) reported that 30% of AYAs reported unmet need for complementary and alternative health approaches. However, to fully address pain in the AYA population, an open dialog between providers and patients should be encouraged to identify the most effective approaches to measuring, discussing, and alleviating cancer-related pain.
Our study also showed that unmet needs for religious/spiritual counseling was associated with worse overall mental health and emotional functioning. Prior research suggests that spirituality is associated with better well-being among cancer patients (see Visser et al., 2010 for a review). It is possible that those experiencing the greatest emotional and overall mental health deficits are looking for ways to ameliorate the negative impact of their cancer on their emotional and mental health, with spiritual/religious counseling being one potential avenue. Alternatively, the side effects and logistics regarding cancer treatment may have disrupted usual participation in spiritual or religious services. In either case, there is a need to better provide spiritual counseling to AYA cancer patients who need it.
Results from this study highlight the need to make developmentally appropriate interventions available and accessible to AYAs with cancer. For example, there may be at-risk subgroups by developmental stage related to age at diagnosis, financial independence, employment and insurance status, among other areas. In recent years, AYA-focused clinical programs have developed (Ferrari et al., 2010), and AYA cancer guidelines for clinical practice were released in 2012 from The National Comprehensive Cancer Network (NCCN, 2012) that included a focus on physical and psychosocial issues. Specific recommendations have been made regarding addressing unmet service needs for AYAs with cancer to improve psychosocial outcomes (Zebrack et al., 2009; Kurtz and Abrams, 2010; D’Agostino et al., 2011), and the kinds of psychosocial, work/school, and financial support services that would be appropriate to this age group have been identified (Zebrack and Isaacson, 2012). One important way to promote appropriate supportive care is to ensure that care providers are making necessary referrals (Kahalley et al., 2012) or to specifically train oncology staff to help navigate or provide relevant care (Turner et al., 2009).
The current study’s findings must be considered within the context of its limitations. Although this is the largest population-based study of AYA cancer survivors to date, and the only study to examine associations between support service needs and HRQOL, the design is cross-sectional, relies on self-report of service use, and examines a select set of services. Furthermore, we were not able to examine details about any service programs offered to survivors in the study, and whether unmet services were due to lack of availability, access, or poor communication about available services. Our modest response rate suggests the possibility of a biased sample; however, no major differences were found on demographic and other characteristics between those who did or did not enroll in the study (Harlan et al., 2011). Additionally, we recognize that the age distribution of the current study (15–39 years at diagnosis) is wide and that the cancer types represented are diverse, such that there may be either developmental or disease-specific differences that we were underpowered to explore in detail. We recognize the importance of exploring issues of independence and developmental stages in future research. In particular, age may not be a precise proxy, as there are many independent or mature adults in their 20s, and there are many individuals in their 30s who are living at home or financially supported by parents – which should be independently examined in future research. However, the intention of the AYA HOPE study was to identify broad areas for future research, and the current study helps provide an indication of potential topics for future study. In particular, our study showed important relationships between specific unmet service needs and physical, emotional, and work/school functioning, highlighting mental health needs, physical or occupational therapy needs, and need for better pain management.
In conclusion, the current study suggests that AYAs with cancer have unmet supportive care service needs and that these needs are associated with decrements in HRQOL. In-depth studies are necessary to tease apart issues regarding availability and access to these service needs, and to determine whether they are being offered routinely or there are subsets of individuals not receiving appropriate care. Future research should examine developmentally appropriate, relevant practices for improving access to services that have been shown to adversely impact HRQOL, particularly mental health, physical/occupational therapy, and pain management services.
Conflict of Interest Statement
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.
Supported by contracts N01-PC-54402, N01-PC-54404, N01-PC-35136, N01-PC-35139, N01-PC-35142, N01-PC-35143, N01-PC-35145.
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Keywords: support service needs, health-related quality of life, adolescent, young adult oncology, cancer
Citation: Smith AW, Parsons HM, Kent EE, Bellizzi K, Zebrack BJ, Keel G, Lynch CF, Rubenstein MB, Keegan THM and AYA HOPE Study Collaborative Group (2013) Unmet support service needs and health-related quality of life among adolescents and young adults with cancer: the AYA HOPE study. Front. Oncol. 3:75. doi: 10.3389/fonc.2013.00075
Received: 31 December 2012; Accepted: 23 March 2013;
Published online: 08 April 2013.
Edited by:Crystal Mackall, National Cancer Institute, USA
Reviewed by:Melinda Merchant, National Cancer Institute, USA
David A. Rodeberg, East Carolina University Brody School of Medicine, USA
Copyright: © 2013 Smith, Parsons, Kent, Bellizzi, Zebrack, Keel, Lynch, Rubenstein, Keegan and AYA HOPE Study Collaborative Group. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.
*Correspondence: Ashley Wilder Smith, Outcomes Research Branch, National Cancer Institute, 6130 Executive Boulevard, MSC 7344, Executive Plaza North, Room 4090, Bethesda, MD 20892-7344, USA. e-mail: firstname.lastname@example.org
†California Cancer Registry/Public Health Institute (Sacramento, CA): Rosemary Cress, DrPH (P.I.); Gretchen Agha; Mark Cruz
Fred Hutchinson Cancer Research Center (Seattle, WA): Stephen M. Schwartz, Ph.D. (P.I.); Martha Shellenberger; Tiffany Janes
Karmanos Cancer Center (Detroit, MI, USA): Ikuko Kato, Ph.D. (P.I.); Ann Bankowski; Marjorie Stock
Louisiana State University (New Orleans, LA, USA): Xiao-cheng Wu, M.D., MPH (P.I.); Vivien Chen; Bradley Tompkins
Cancer Prevention Institute of California (Fremont, CA, USA): Theresa Keegan, Ph.D, M.S. (P.I.); Laura Allen; Zinnia Loya; Karen Hussain
University of Iowa (Iowa City, IA, USA): Charles F. Lynch M.D., Ph.D. (P.I.); Michele M. West, Ph.D.; Lori A. Odle, R.N.
University of Southern California (Los Angeles, CA, USA): Ann Hamilton, Ph.D (P.I.); Jennifer Zelaya; Mary Lo; Urduja Trinidad
National Cancer Institute (Bethesda, MD, USA): Linda C. Harlan, BSN, MPH, Ph.D.; (Investigator) Ashley Wilder Smith, Ph.D., MPH (Investigator); Jana Eisenstein, MPH; Gretchen Keel, BS, BA.
Consultants: Arnold Potosky, Ph.D.; Keith Bellizzi, Ph.D.; Karen Albritton, MD, Michael Link, MD; Brad Zebrack, Ph.D., MSW.