1. Allergy Unit, Department of Dermatology, University Hospital Zurich, Zurich, Switzerland
2. Christine Kühne Center for Allergy Research and Education CK-CARE, Davos, Switzerland
3. Faculty of Medicine, University of Zurich, Zurich, Switzerland
4. Reference Center for Toxic Bullous Diseases and Severe Drug Reactions, Créteil, France
5. Department of Dermatology, Assistance Publique–Hôpitaux de Paris, Henri Mondor hospital, Créteil, France
6. Univ Paris Est Créteil EpiDermE, Créteil, France