| Affiliation: | 1. Department of Family Medicine and Population Health, Division of Epidemiology, Virginia Commonwealth University School of Medicine, Richmond, Virginia, USA;2. Research Center for Group Dynamics, Institute for Social Research, University of Michigan, Ann Arbor, Michigan, USA;3. Department of Psychiatry, Geisel School of Medicine at Dartmouth, Dartmouth University, Hanover, New Hampshire, USA;4. Office of Research Development, Duke University School of Medicine, Durham, North Carolina, USA |
