1. a Johns Hopkins Bloomberg School of Public Health , Baltimore, Maryland
2. b The Children's Hospital of Philadelphia , Philadelphia, Pennsylvania, USA
3. c Johns Hopkins Bloomberg School of Public Health , Baltimore, Maryland, USA
4. d Department of Counseling, Clinical, and School Psychology , University of California, Santa Barbara , Santa Barbara, California, USA
5. e Johns Hopkins Bloomberg School of Public Health, Johns Hopkins Center for the Prevention of Youth Violence , Baltimore, Maryland, USA