[1] Univ Penn, Dept Dermatol, Philadelphia, PA 19103 USA
[2] Tech Univ Dresden, Dept Dermatol, D-01307 Dresden, Germany
[3] Univ Groningen Hosp, Dept Dermatol, NL-9700 RB Groningen, Netherlands
[4] Malmo Univ Hosp, Dept Dermatol, SE-20502 Malmo, Sweden
[5] Univ Lucerne, Dept Hlth Sci & Policy, Luzern, Switzerland
[6] Queens Med Ctr, Dept Dermatol, Nottingham NG7 2UH, England