[1] Charite Univ Med Berlin, Freie Univ Berlin & Humboldt Univ Berlin, Dept Dermatol Venereol & Allergol, Div Evidence Based Med dEBM, Berlin, Germany
[2] Charite Univ Med Berlin, Freie Univ Berlin & Humboldt Univ Berlin, Dept Dermatol, Berlin, Germany
[3] Charite Univ Med Berlin, Dept Dermatol Venereol & Allergol, Charitepl 1, D-10117 Berlin, Germany