[1] Univ Calif San Diego, Moores Canc Ctr, Canc Prevent Program, La Jolla, CA 92093 USA
[2] Univ Calif San Diego, Dept Family Med & Publ Hlth, La Jolla, CA 92093 USA
[3] Geisel Sch Med Dartmouth, Norris Cotton Canc Ctr, C Everett Koop Inst, Hanover, NH USA
[4] US FDA, Ctr Tobacco Prod, Silver Spring, MD USA
[5] Natl Inst Drug Abuse, NIH, Bethesda, MD USA
[6] Kelly Govt Solut, Rockville, MD USA
[7] NCI, Tobacco Control Res Branch, Behav Res Program, Div Canc Control & Populat Sci,NIH, Rockville, MD USA
[8] Westat Corp, Rockville, MD USA
[9] Georgetown Univ, Med Ctr, Lombardi Comprehens Canc Ctr, Dept Oncol,Canc Prevent & Control Program, Washington, DC 20007 USA
[10] Roswell Pk Canc Inst, Dept Hlth Behav, Buffalo, NY 14263 USA
[11] Johns Hopkins Univ, Bloomberg Sch Publ Hlth, Dept Hlth Behav & Soc, Baltimore, MD USA