[1] Dana Farber Canc Inst, Ctr Community Based Res, Boston, MA 02115 USA
[2] NCI, Tobacco Control Res Branch, Rockville, MD USA
[3] Dana Farber Canc Inst, Dept Pediat Oncol, Boston, MA 02115 USA
[4] Brigham & Womens Hosp, Channing Lab, Boston, MA 02115 USA
[5] Univ Massachusetts, Sch Publ Hlth, Dept Biostat & Epidemiol, Amherst, MA 01003 USA
[6] Harvard Univ, Sch Publ Hlth, Dept Hlth & Social Behav, Boston, MA 02115 USA