1. Department of Dermatology University Hospital of Brest Brest France
2. Department of Dermatology, Occupational Dermatology Ruprecht‐Karls University Heidelberg Heidelberg Germany
3. Department of Health, Medical and Neuropsychology Faculty of Social and Behavioral Science Leiden The Netherlands
4. Department of Dermatology Center for Chronic Pruritus University Hospital Münster Münster Germany
5. Department of Dermatology University of Rzeszow Rzeszów Poland
6. San Gallicano Dermatological Institute Rome Italy
7. Department of Dermatology Hospital de la Santa Creu i Sant Pau Barcelona Spain
8. Department of Dermatology and Venereology Skåne University Hospital Lund Sweden
9. Section of Biostatistics University of Oslo Oslo Norway
10. Department of Dermatology and Allergy Charité‐Universitätsmedizin Berlin Berlin Germany
11. Department of Dermatology, Venereology and Allergology Wroclaw Medical University Wroclaw Poland
12. Department of Dermatology School of Medicine University of California, San Francisco San Francisco CA USA