Priorities for research to reduce the threat of firearm-related violence [electronic resource] / Committee on Priorities for a Public Health Research Agenda to Reduce the Threat of Firearm-Related Violence ; Executive Office, Institute of Medicine ; Committee on Law and Justice, Division of Behavioral and Social Sciences and Education ; Alan I. Leshner, Bruce M. Altevogt, Arlene F. Lee, Margaret A. McCoy, and Patrick W. Kelley, editors ; Institute of Medicine and National Research Council of the National Academies