1. Department of Dermatology and Center for Chronic Pruritus University Hospital Münster Münster Germany
2. Department of Dermatology and Allergy Technical University of Munich Munich Germany
3. Department of Dermatology Medical University of Graz Graz Austria
4. Department of Dermatology University Hospital of AntwerpUniversity of Antwerp Antwerp Belgium
5. Department of Dermatology University Hospital Gentofte Copenhagen Denmark
6. Department of Dermatology University Hospital of Brest Brest France
7. Department of Dermatology and Venereology University of Athens Medical SchoolAttikon Hospital Athens Greece
8. Dipartimento di Scienze Mediche e Chirurgiche Fondazione Policlinico Universitario A. Gemelli IRCCSUOC DermatologiaUniversità Cattolica del Sacro Cuore Rome Italy
9. Department of Health, Medical and Neuropsychology Institute of Psychology Leiden University Leiden The Netherlands
10. Department of Dermatology Oslo University HospitalUniversity of Oslo Oslo Norway
11. Department of Dermatology, Venereology and Allergology Wroclaw Medical University Poland
12. Department of Dermatology University of Rzeszów Rzeszów Poland
13. Department of Dermatology University Hospital and Faculty of Medicine University of Coimbra Coimbra Portugal
14. Moscow Scientific and Practical Center of Dermatovenereology and Cosmetology Moscow Russia
15. Department Dermatology Sant Pau Hospital Barcelona Spain
16. Department of Clinical Sciences Lund, Dermatology and Venereology Lund University Lund Sweden
17. Skane University Hospital Lund Sweden
18. Department of Dermatology Aydin Adnan Menderes University Aydın Turkey
19. Royal Free Hospital London UK