From the Departments of Surgery, Epidemiology, and Global Health, University of Washington, Seattle, Washington.
Submitted for publication March 9, 2011.
Accepted for publication March 10, 2011.
Presented in part at the 69th Meeting of the American Association for the Surgery of Trauma, September 24, 2010, Boston, Massachusetts.
Address for reprints: Charles Mock, MD, PhD, FACS, Harborview Injury Prevention and Research Center, Box 359960, Harborview Medical Center, 325 Ninth Avenue, Seattle, WA 98104; email: firstname.lastname@example.org.