Affiliation: | 1. Department of Family Medicine and Population Health, Division of Epidemiology, Virginia Commonwealth University School of Medicine, 830 East Main Street, Richmond, VA 23298, USA;2. Virginia Institute for Psychiatric and Behavioral Genetics, Virginia Commonwealth University, 800 East Leigh Street, Richmond, VA 23219, USA;3. Research Center for Group Dynamics, Institute for Social Research, University of Michigan, 426 Thompson Street, Ann Arbor, MI 48106, USA |