1. Department of Dermatology, Venereology and Allergology; HELIOS-Klinikum Hildesheim; Hildesheim Germany
2. Clinica Dermatologica; Azienda Ospedaliero Universitaria di Cagliari; Cagliari Italy
3. Kempf und Pfaltz; Histologische Diagnostik; Research unit; Zürich Switzerland