1. Department of Dermatology, Center for Chronic Pruritus University Hospital Münster Münster Germany
2. Division of Occupational Dermatology, Department of Dermatology University of Heidelberg Heidelberg Germany
3. Department of Dermatology Oslo University Hospital University of Oslo Oslo Norway
4. Department of Dermatology and Venereology Lund University, Skane University Hospital Lund Sweden
5. Department of Dermatology Medical University of Graz Graz Austria
6. Catholic University of the Sacred Heart Rome Italy
7. Department of Dermatology Aydın Adnan Menderes University Aydın Turkey
8. Department of Dermatology University of Rzeszów Rzeszów Poland
9. Department of Dermatovenereology and Cosmetology, Central State Medical Academy of Department of Presidential Affairs Moscow Russia
10. Medical Research and Educational Center Lomonosov Moscow State University Moscow Russia
11. Moscow Scientific and Practical Center of Dermatovenerology and Cosmetology Moscow Russia
12. Institute of Allergology, Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt‐Universität zu Berlin Berlin Germany
13. Allergology and Immunology Fraunhofer Institute for Translational Medicine and Pharmacology ITMP Berlin Germany
14. Department of Dermatology Kantonsspital Aarau Aarau Switzerland
15. Department of Dermatology University Hospital of Brest Brest France
16. Department of Dermatology Sant Pau Hospital Barcelona Spain
17. Department of Dermatology University Hospital and Faculty of Medicine, University of Coimbra Coimbra Portugal
18. Department of Dermatology, Venereology and Allergology Wroclaw Medical University Wroclaw Poland
19. Competence Center for Healthcare Research in Dermatology (CVderm), Institute for Healthcare Research in Dermatology and Nursing (IVDP) University Hospital of Hamburg‐Eppendorf Hamburg Germany
20. Department of Dermatology and Allergy Technical University of Munich, School of Medicine Munich Germany