1. Department of Dermatology Copenhagen University Hospital Bispebjerg and Frederiksberg Nielsine Nielsens Vej 17, entrance 9, 2. floor Copenhagen Nordvest DK‐2400 Denmark
2. Department of Dermatology Erasmus MC University Medical Center Rotterdam Dr. Molewaterplein 40 Rotterdam 3015 The Netherlands
3. Skinperium, Private Dermatology Clinic Rue Charles Martel 52 Luxembourg 2134 Luxembourg