1. At the time of the study, Aaron B. Shev, Garen J. Wintemute, Magdalena Cerdá, and Andrew Crawford were with the Violence Prevention Research Program, Department of Emergency Medicine; Susan L. Stewart is with the Department of Public Health Sciences, Division of Biostatistics; and Stephen G. Henry is with the Department of Internal Medicine, Division of General Medicine, Geriatrics, & Bioethics, School of Medicine, University of California, Davis.