1. Department of Dermatology, Centre hospitalier universitaire de Nantes, Nantes, France;
2. Department of Dermatology and Allergy, Charité – Universitätsmedizin Berlin, Berlin, Germany;
3. Department of Microbiology, Trinity College Dublin, Dublin, Ireland;
4. Allergy Unit, Department of Dermatology, University Hospital of Zürich, Zürich, Switzerland;
5. Department of Dermatology, University of Kiel, Kiel, Germany