1. Department of Dermatology Ghent University Hospital Ghent Belgium
2. Department of Dermatology Université Côte d'Azur CHU Nice Nice France
3. Department of Dermatology & INSERM U1065, C3M Nice France
4. Department of Dermatology Institute for Pigment Disorders and Infection & Immunity Institute Amsterdam UMC Amsterdam the Netherlands
5. Department of Dermatology Henri Mondor Hospital UPEC‐Université Paris‐Est Créteil Paris France