1 Departments of dermatology, allergology and venereology, University of Helsinki, Helsinki University Central Hospital, Meilahdentie 2, PO Box 160, 00029 Helsinki, Finlande. Electronic address: nicolas.kluger@hus.fi.
2 Departments of dermatology, allergology and venereology, University of Helsinki, Helsinki University Central Hospital, Meilahdentie 2, PO Box 160, 00029 Helsinki, Finlande.