1. Department of Dermatology, New Cross Hospital , The Royal Wolverhampton NHS Trust, Wolverhampton , UK
2. Department of Dermatology, Henri Mondor University Hospital , Créteil , France
3. Department of Dermatology, Faculty of Medicine, Saint Joseph University , Beirut , Lebanon
4. Department of Epidemiology and Public Health, UMR 1027 INSERM, Toulouse University Hospital , Toulouse , France
5. Department of Dermatology, St Vincent’s Hospital, College of Medicine, The Catholic University of Korea , Seoul , Republic of Korea
6. Department of Dermatology, Ghent University Hospital , Ghent , Belgium
7. EA 7379 EpidermE, Faculty of Medicine, Université Paris-Est Créteil , UPEC, Créteil , France