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