[1] Univ Miami, Sch Med, Dept Epidemiol & Publ Hlth, Tobacco Res & Evaluat Ctr, Miami, FL 33136 USA
[2] Ctr Dis Control & Prevent, Natl Ctr Chron Dis Prevent & Hlth Promot, Off Smoking & Hlth, Atlanta, GA 30341 USA
[3] NCI, Div Canc Control & Populat Sci, Bethesda, MD 20892 USA