[1] Harvard Univ, Sch Publ Hlth, Dept Soc Human Dev & Hlth, Boston, MA 02115 USA
[2] Carol Davila Univ Med & Pharm Bucharest, Elias Univ Hosp, Dept Dermatol, Bucharest, Romania
[3] Univ Libre Bruxelles, Erasme Hosp, Dept Dermatol, Euromelanoma Chair, B-1070 Brussels, Belgium
[4] Erasmus MC Univ Med Ctr Rotterdam, Dept Publ Hlth, NL-3015 GE Rotterdam, Netherlands
[5] Erasmus MC Univ Med Ctr Rotterdam, Dept Dermatol, NL-3015 GE Rotterdam, Netherlands
[6] Brigham & Womens Hosp, Boston, MA 02115 USA