1. Department of Dermatology and Expert Center on Pruritus University Hospital of Brest Brest France
2. Department of Medicine University of Padua Padua Italy
3. Dermatology Unit Bambino Gesù Children's HospitalIRCCS Rome Italy
4. Department of Dermatology and Venereology National Medical University Kiev Ukraine
5. Department of Medical Research Lund University Malmö Sweden
6. Centre for Clinical Research Örebro University Örebro Sweden
7. Department of Dermatology and Allergy Hannover Medical School Hannover Germany
8. Division of Dermatology Department of Pediatrics University of MontrealSte‐Justine Hospital Montreal QC Canada
9. Department of Dermatology University of Sao Paulo Medical School Sao Paulo Brazil
10. Department of Dermatology University Hospital of Nantes Nantes France
11. Departments of Dermatology and Pediatrics University of California San Diego CA USA