1. Department of Dermatology; Ghent University Hospital; Ghent Belgium
2. INSERM U 1035; University of Bordeaux; Bordeaux France
3. Department of Dermatology; Bordeaux University Hospitals; Bordeaux France
4. Netherlands Institute for Pigment Disorders (NIPD); Department of Dermatology; Academic Medical Centre; Amsterdam the Netherlands
5. Department of Dermatology; Henry Ford Hospital; Detroit MI USA
6. Department of Dermatology; The University of Texas Southwestern Medical Center; Dallas TX USA
7. Centre of Evidence Based Dermatology; University of Nottingham; Nottingham UK
8. Service de Dermatologie; Hôpital Henri Mondor; UPE-Université Paris-Est; Créteil France
9. San Gallicano Dermatologic Institute; Rome Italy
10. Department of Epidemiology and Biostatistics; EMGO Institute for Health and Care Research; VU University Medical Center; Amsterdam the Netherlands
11. Department of Dermatology; The University of Massachusetts Medical School; Worcester MA USA