1. Center for Chronic Pruritus (KCP) and Department of Dermatology; University Medical Center; Münster Germany
2. Institute for Health Care Research in Dermatology and Nursing (IVDP), Competence Center for Nursing Research in Dermatology (CVderm); University Medical Center Hamburg-Eppendorf; Hamburg Germany
3. Institute of General Medicine; Charité - University Medical Center; Berlin Germany
4. Department of Medicine I, Gastroenterology, Pulmonology, and Endocrinology; University of Erlangen-Nuremberg; Germany
5. Department of Dermatology, Venereology; Graz Medical University; Graz Austria
6. Center for General Medicine, Medical Faculty; University of Münster; Germany
7. Department of Nephrology; DKD Helios Klinik; Wiesbaden Germany
8. Allergy Center Charité, Department of Dermatology, Venereology, and Allergology; Charité - University Medical Center; Berlin Germany
9. Division of Evidence-Based Medicine (dEBM), Department of Dermatology, Venereology, and Allergology; Charité - University Medical Center; Berlin Germany
10. Department of Dermatology, Venereology, and Allergology; University Medical Center Giessen and Marburg (Giessen site) and Practice for Dermatology, Psychotherapy, and Psychoanalysis; Giessen Germany
11. Department of Dermatology; Allergology Faculty of Medicine and Health Science, University of Oldenburg, Klinikum Oldenburg AöR, Oldenburg; Germany
12. Department of Psychosomatic Medicine and Psychotherapy; University Medical Cener; Münster Germany
13. Dermatology Bad Bentheim; Dermatology Practice at Paulinenkrankenhaus Bad Bentheim and Department of Dermatology Medical Center Dortmund gGmbH; Dortmund Germany
14. Clinical Research Center; Department of Dermatology; University Medical Center; Mainz Germany
15. Department of Dermatology, Aarau Canton Hospital; Aarau Switzerland
16. Department of Clinical Social Medicine, Occupational and Environmental Dermatology; University Medical Center; Heidelberg Germany