1. Department of Dermatology and Venereology National Medical University Kiev Ukraine
2. Department of Dermatology University Hospital Miguel Servet, Aragon Psychodermatology, Research Group (GAI + PD) Zaragoza Spain
3. Department of Psychology University of Zaragoza Zaragoza Spain
4. Children's Hospital Zagreb, Medical School University of Zagreb Zagreb Croatia
5. National Children's Hospital “Okhmatdyt” Kiev Ukraine
6. Paediatric Dermatology Discipline, Dermatology Research Unit Colentina Clinical Hospital, “Carol Davila” University of Medicine and Pharmacy Bucharest Romania
7. Department of Dermatology II Colentina Clinical Hospital, "Carol Davila" University of Medicine and Pharmacy Bucharest Romania
8. Department of Paediatric Dermatology Colentina Clinical Hospital, "Carol Davila" University of Medicine and Pharmacy Bucharest Romania
9. Department of Dermatovenereology University of Belgrade School of Medicine Belgrade Serbia
10. First Department of Pediatrics, Medical School National and Kapodistrian University of Athens Athens Greece
11. Department of Dermatology and Venereology, Faculty of Medicine Medical University Pleven Bulgaria
12. Department of Dermatology and Venereology Acibadem City Clinic Tokuda Hospital Sofia Bulgaria
13. Department of Dermatology and Venereology Trakia University Stara Zagora Bulgaria
14. Clinical Epidemiology Unit IDI‐IRCCS Rome Italy