[1] Charite Univ Med Berlin, Dept Dermatol & Allergy, Allergie Ctr Charite, Dermatol Allergol, Berlin, Germany
[2] Humboldt Univ, Freie Univ Berlin, Berlin, Germany
[3] Med Univ Vienna, Dept Pediat & Adolescent Med, Vienna, Austria
[4] IM Sechenov First Moscow State Med Univ Sechenov, Div Immune Mediated Skin Dis, Moscow, Russia