Am J Prev Med 2013 Oct;45(4):430-40
Cancer Prevention and Control Program (Hébert, Wirth, L. Davis, B. Davis, Harmon, Hurley, Drayton, Shivappa, Adams, Brandt, Armstead, Steck), Arnold School of Public Health, University of South Carolina, Columbia, South Carolina; Department of Epidemiology and Biostatistics (Hébert, Wirth, Shivappa, Adams, Steck, Blair), Arnold School of Public Health, University of South Carolina, Columbia, South Carolina. Electronic address: