[1] Boston Univ, Sch Med, Dept Dermatol, Boston, MA 02118 USA
[2] Boston Univ, Sch Publ Hlth, Dept Epidemiol & Biostat, Canc Prevent & Control Ctr, Boston, MA USA
[3] Harvard Univ, Sch Publ Hlth, Harvard Sch Med,Brigham & Womens Hosp, Dept Med,Channing Lab, Boston, MA 02115 USA
[4] Dana Farber Canc Inst, Dept Pediat Oncol, Boston, MA 02115 USA
[5] Mem Sloan Kettering Canc Ctr, Dept Med, Serv Dermatol, New York, NY 10021 USA
[6] Ctr Dis Control & Prevent, Atlanta, GA USA