1. Department of Pediatrics O.L.Vrouw Hospital Aalst Aalst Belgium
2. Department of Pediatrics Katholieke Universiteit Leuven Leuven Belgium
3. Department of Pediatrics Universiteit Gent Gent Belgium
4. Clinic for Dermatology, Venerology and Allergology University Clinic Schleswig‐Holstein Kiel Germany
5. Interdisciplinary Unit of Pediatric Dermatology Vrije Universiteit Brussel (VUB) Universitair Ziekenhuis Brussel (UZ Brussel) Brussel Belgium