1. Centroderm Clinic, Wuppertal, and Faculty of Health, University of Witten-Herdecke, Witten, Germany;
2. Department of Dermatology, Monklands Hospital, Lanarkshire, and University of Glasgow, Glasgow, UK;
3. Dermatology Clinic, University of Catania, Catania, Italy;
4. Klinik für Dermatologie, Venerologie und Allergologie, St. Josef-Hospital, Ruhr-Universität Bochum, Bochum, Germany;
5. Policlinique de Dermatologie, Hôpital Saint-Louis, Paris, France;
6. Department of Dermatology, Hôpital Erasme – Université Libre de Bruxelles, Bruxelles, Belgium;
7. Department of Dermatology Skin Cancer Unit, University Hospital Zürich, Zurich, Switzerland;
8. Department of Dermatology, Zealand University Hospital, Roskilde; Health Sciences Faculty, University of Copenhagen, Copenhagen, Denmark;
9. Dermatology Department, Melanoma Unit, Hospital Clínic de Barcelona, IDIBAPS, Universitat de Barcelona, Barcelona, Spain;
10. Centro de Investigación Biomédica en Red en Enfermedades Raras (CIBERER), Valencia, Spain;
11. Department of Dermatology, Catholic University of Rome, Largo A. Gemelli 8, Rome, Italy;
12. First Department of Dermatology-Venereology, University of Athens Medical School, Andreas Sygros Hospital, Athens, Greece;
13. Non-Melanoma Skin Cancer Unit, Department of Dermatology and Venereology, Medical University of Graz, Graz, Austria;
14. Department of Dermatology, University of Modena and Reggio Emilia, Modena, Italy