[1] Boston Univ, Sch Med, Dept Dermatol, Boston, MA 02118 USA
[2] Boston Univ, Sch Publ Hlth, Dept Epidemiol, Boston, MA 02215 USA
[3] Boston Univ, Sch Publ Hlth, Dept Biostat, Boston, MA 02215 USA
[4] Massachusetts Gen Hosp, Boston, MA 02114 USA
[5] Mem Sloan Kettering Canc Ctr, New York, NY 10021 USA
[6] Brown Univ, Dept Dermatol, Providence, RI 02912 USA
[7] Dept Vet Affairs Med Ctr, Dermatoepidemiol Unit, Providence, RI USA
[8] Massachusetts Dept Publ Hlth, Boston, MA USA