1. Department of Dermatology; D-92; Bispebjerg Hospital; University of Copenhagen; Bispebjerg Bakke 23 DK-2400 Copenhagen NV Denmark
2. Wellman Center for Photomedicine; Massachusetts General Hospital; Harvard Medical School; Boston MA U.S.A.
3. Departments of Dermatology, Venereology and Allergology; University of Leipzig; Leipzig Germany