1. From the Departments of Exercise Science (S.P.H., X.S., S.N.B.), Epidemiology and Biostatistics (N.C., J.V., S.N.B.), and Prevention Research Center (S.P.H., N.C.), Arnold School of Public Health, University of South Carolina, Columbia, SC; the Department of Public Health Sciences (J.L.), University of North Carolina at Charlotte, Charlotte, NC; and the Department of Social and Preventive Medicine (M.J.L.), University at Buffalo, Buffalo, NY.