1. Department of Dermatology University of Münster Münster Germany
2. Centroderm Clinic Wuppertal Germany
3. Faculty of Health University Witten‐Herdecke Witten Germany
4. Department of Dermatology and Allergy Technical University of Munich Munich Germany
5. Unit of Dermatology Department of Medicine Karolinska Institutet and Karolinska University Hospital Stockholm Sweden
6. Department of Dermatology and Venereology Otto‐von‐Guericke University Magdeburg Germany
7. University Department of Dermatology Edinburgh UK
8. Department of Dermatology Antwerp University HospitalUniversity of Antwerp Antwerp Belgium
9. Dermatology Clinic University of Catania Catania Italy
10. Department of Dermatology Frankfurt University Hospital Frankfurt/Main Germany
11. Center for Chronic Pruritus Department of Dermatology University Hospital Münster Münster Germany
12. Chair and Institute of Environmental Medicine UNIKA‐TTechnical University of Munich and Helmholtz Zentrum München Augsburg Germany