1. Department of Dermatology Feinberg School of Medicine Northwestern University Chicago IL USA
2. Department of Dermatology George Washington University School of Medicine and Health Sciences Washington DC USA
3. Department of Dermatology Universitair Ziekenhuis Brussel (UZ Brussel) Vrije Universiteit Brussel (VUB) Brussels Belgium
4. Department of Dermatology West Virginia University School of Medicine Morgantown WV USA
5. Massachusetts General Hospital Harvard Medical School Boston MA USA
6. Department of Dermatology and Allergy Copenhagen University Hospital Herlev‐Gentofte Copenhagen Denmark
7. George Washington University School of Medicine and Health Sciences Washington DC USA