1. Center for Chronic Pruritus (KCP) Department of Dermatology University Hospital Münster Münster Germany
2. Institute for Health Services Research in Dermatology and Nursing (IVDP) University Medical Center Hamburg‐Eppendorf Hamburg Germany
3. Department of Dermatology and Allergology Biederstein Faculty of Medicine Technical University of Munich Munich Germany
4. Department of Gastroenterology and Hepatology University Hospital Zürich Zürich Switzerland
5. Department of Medicine 1 Department of Gastroenterology Pneumology and Endocrinology Friedrich‐Alexander‐University Erlangen‐Nürnberg Erlangen Germany
6. Department of Dermatology and Venereology Medical University of Graz Graz Austria
7. Department of Hematology Oncology Hemostaseology and Stem Cell Transplantation (Med. Clinic IV) Faculty of Medicine RWTH Aachen University Aachen Germany
8. Institute of Medical Psychology Justus Liebig University Giessen Germany
9. KfH Kidney Center und DKD Helios Klinik Wiesbaden Germany
10. Institute of Allergology Charité, Universitätsmedizin Berlin Berlin Germany
11. Fraunhofer Institute for Translational Medicine and Pharmacology ITMP Allergology and Immunology Berlin Germany
12. Division of Evidence Based Medicine (DEBM) Department of Dermatology Venereology and Allergology Charité – Universitätsmedizin Berlin Berlin Germany
13. University Hospital of Dermatology and Allergy Medical Center Oldenburg Oldenburg Germany
14. Department for Psychosomatic Medicine and Psychotherapy University Hospital Münster Münster Germany
15. Dermatology Bad Bentheim Office of Dermatology at Paulinenkrankenhaus Bad Bentheim and Department of Dermatology Medical Center Dortmund Dortmund Germany
16. Aarau Canton Hospital Aarau Switzerland
17. Devision of Occupational Dermatology Department of Dermatology University Medical Center Heidelberg Heidelberg Germany