[1] St Louis Univ, Sch Publ Hlth, Dept Community Hlth, St Louis, MO 63108 USA
[2] St Louis Univ, Sch Publ Hlth, Prevent Res Ctr, St Louis, MO 63108 USA
[3] NCI, Div Canc Epidemiol & Genet, Rockville, MD USA
[4] Missouri Dept Hlth, Div Chron Dis Prevent & Hlth Promot, Columbia, MO USA