1. Virginia Institute for Psychiatric and Behavioral Genetics and Department of Psychiatry, Virginia Commonwealth University, Richmond, (Kendler); Center for Primary Health Care Research, Lund University, Malmö, Sweden (Abrahamsson, Ohlsson, J. Sundquist, K. Sundquist); Department of Family Medicine and Community Health, Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York (J. Sundquist, K. Sundquist).