[1] Natl Inst Minor Hlth & Hlth Dispar, Div Intramural Res, Bethesda, MD USA
[2] US FDA, Ctr Tobacco Prod, Off Sci, Beltsville, MD USA
[3] Informat Management Serv Inc, Calverton, MD USA
[4] Natl Inst Minor Hlth & Hlth Dispar, Off Director, Bethesda, MD USA
[5] 9000 Rockville Pike Bldg 3 Room 5W05, Bethesda, MD 20892 USA