1. Department of Dermatology University Hospitals Leuven Leuven Belgium
2. Dermatology Department Reference Centre for Rare Skin Diseases Larrey Hospital University P Sabatier Toulouse France
3. Zentrum für seltene und genetische Hautkrankheiten Ludwig‐Maximilians‐Universität München München Germany
4. Department of Dermatology Hospital Infantil Niño Jesús Madrid Spain
5. Department of Public Health and Primary Care KU Leuven Leuven Belgium
6. Pediatric dermatology unit Dept of pediatrics and dermatology University hospital CHUV Lausanne and University of Lausanne Lausanne Switzerland