1. Department of Epidemiology and Biostatistics Memorial Sloan‐Kettering Cancer Center 1275 York Avenue New York NY 10065 U.S.A
2. Division of Epidemiology and Biostatistics University of New Mexico MSC08 4630 Room 103A Albuquerque NM 87131 U.S.A
3. Department of Medicine, Dermatology Service Memorial Sloan‐Kettering Cancer Center 160 East 53rd St New York NY 10022 U.S.A
4. Department of Dermatology Sheba Medical Center and Sackler School of Medicine Tel Aviv University Tel Aviv Israel