Katherine M. Keyes and Ava Hamilton are with the Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY. Katherine M. Keyes is also with the Society and Health Research Center, Facultad de Humanidades, Universidad Mayor, Santiago, Chile, and is a Guest Editor for this supplement issue. Jeffrey Swanson is with Psychiatry and Behavioral Sciences, Social and Community Psychiatry, School of Medicine, Duke University, Durham, NC. Melissa Tracy is with the Department of...