[1] Harvard Univ, Sch Publ Hlth, Boston, MA 02115 USA
[2] Dana Farber Canc Inst, Div Community Based Res, Boston, MA 02115 USA
[3] Univ Calif Berkeley, Berkeley, CA 94720 USA
[4] Univ Rhode Isl, Kingston, RI 02881 USA
[5] Mem Hosp Rhode Isl, Providence, RI 02912 USA
[6] Brown Univ, Providence, RI 02912 USA