AUTHOR=Liu Cunming , Yang Chun TITLE=Commentary: Serum Biomarkers Are Potential Diagnosis and Treatment Targets for Depressive Symptoms in Patients With Cardiovascular Diseases JOURNAL=Frontiers in Psychiatry VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/psychiatry/articles/10.3389/fpsyt.2021.649705 DOI=10.3389/fpsyt.2021.649705 ISSN=1664-0640