1. Office of the Clinical Director, Intramural Research Program, National Institute of Mental Health, Bethesda, Maryland, USA (A. X. Wei, M. Pao, L. M. Horowitz); Department of Psychology, Rutgers University, New Brunswick, New Jersey, USA (A. M. Mournet); Center for Suicide Prevention and Research, Abigail Wexner Research Institute, Nationwide Children's Hospital, Columbus, Ohio, USA (J. A. Bridge, D. A. Ruch)