1: University of Zurich, Clinic of Dermatology, Zurich/Switzerland
2: University of Basel, Clinic of Dermatology, Basel/Switzerland
3: University of Bern, Clinic of Dermatology, Bern/Switzerland
4: University of Lausanne, Clinic of Dermatology, Lausanne/Switzerland
5: University of Jena, Clinic of Dermatology, Jena/Germany
6: Dermatologisches Ambulatorium, Stadtspital Triemli, Zurich/Switzerland
