[1] Charite, Dept Dermatol Venerol & Allergol, Berlin, Germany
[2] Free Univ Berlin, Berlin, Germany
[3] Humboldt Univ, Berlin, Germany
[4] Univ Bochum, Univ Hosp Ruhr, Johannes Wesling Hosp Minden, Dept Dermatol Venerol Allergol & Phlebol, Bochum, Germany
[5] Charite, Inst Clin Nursing Sci, Berlin, Germany
[6] Charite Univ Med Berlin, Dept Dermatol Venerol & Allergol, Charitepl 1, D-10117 Berlin, Germany