1. Department of Dermatology Centre de Référence des Maladies Bulleuses Autoimmunes
2. Department of Immunology INSERM U1234Rouen University Hospital Rouen France
3. Department of Dermatology Medical University of Sofia Sofia Bulgaria
4. 2nd Department of Dermatology and Venerology Papageorgiou General Hospital Aristotle University School of Medicine Thessaloniki Greece
5. Department of Dermatology Nantes University Hospital Nantes France
6. Università degli Studi di MilanoFondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milan Italy
7. Department of Dermatology Brest University Hospital Brest France
8. Department of Dermatology Avicenne HospitalUniversity Paris 13 Bobigny France
9. Department of Dermatology Bichat HospitalAP‐HP Paris France
10. Department of Dermatology Medical Center University of Freiburg Freiburg Germany
11. Department of Dermatology Monod General Hospital Le Havre France
12. Department of Dermatology Centre Hospitalier de Cornouaille Quimper France
13. Department of Dermatology University of Lubeck Lubeck Germany
14. Department of Dermatology and Venerology Medical University of Lodz Lodz Poland
15. Department of Dermatology Lille University Hospital Lille France
16. Department of Dermatology HELIOS University of Wuppertal Wuppertal Germany