Richardson, Erin G. S.M.; Hemenway, David PhD
From the Department of Health Services (E.G.R.), UCLA School of Public Health, Los Angeles, California; and Harvard Injury Control Research Center (D.H.), Harvard School of Public Health, Boston, Massachusetts.
Submitted for publication October 26, 2009.
Accepted for publication March 2, 2010.
David Hemenway received partial support from the Joyce Foundation.
Address for reprints: Erin G. Richardson, S.M., Department of Health Services, UCLA School of Public Health, PO Box 951772, Los Angeles, CA 90095-1772; email: [email protected].