[1] Henry Ford Hosp, Dept Dermatol, Detroit, MI 48202 USA
[2] Henry Ford Hosp, Dept Publ Hlth Sci, Detroit, MI 48202 USA
[3] Kaiser Permanente No Calif, Div Res, Oakland, CA USA
[4] Harvard Univ, Sch Med, Dept Populat Med, Boston, MA USA
[5] Harvard Pilgrim Hlth Care Inst, Boston, MA USA
[6] Harvard Univ, Sch Publ Hlth, Div Publ Hlth Practice, Boston, MA 02115 USA
[7] Mem Sloan Kettering Canc Ctr, Dermatol Serv, New York, NY 10021 USA
[8] Vet Affairs Med Ctr, Dermatoepidemiol Unit, Providence, RI USA
[9] Rhode Isl Hosp, Dept Dermatol, Providence, RI USA
[10] Brown Univ, Dept Dermatol, Providence, RI 02912 USA
[11] Brown Univ, Dept Community Hlth, Providence, RI 02912 USA