Groupe de Recherche sur le Psoriasis (GrPso) of the Société Française de Dermatologie, the Groupe de recherche de la Société Française de Dermatologie Pédiatrique (GR SFDP), the PsoProtect study group, the British Society of Paediatric Dermatology, and the Società Italiana di Dermatologia Pediatrica (S.I.Der.P.):
1 Department of Dermatology, Hôpital Victor Dupouy, Argenteuil, France.
2 Dermatology Unit, Arcispedale S. Maria Nuova, Azienda USL-IRCCS di Reggio Emilia, Reggio Emilia, Italy.
3 Department of Public Health, Hôpital Raymond Poincaré, Garches, France.
4 Department of Dermatology, Hôpitaux de Brabois, Centre Hospitalier Universitaire de Nancy, Vandœuvre-lès-Nancy, France.
5 Pediatric Dermatology Unit, Department of Medicine DIMED, University of Padova, Padova, Italy.
6 Department of Dermatology, Paediatric Dermatology and Oncology, Medical University of Lodz, Lodz, Poland.
7 J. T. Skin Care Centre, Chennai, India.
8 Department of Dermatology, Voivodship Specialist Hospital in Slupsk, Slupsk, Poland.
9 Department of Dermatology, Dr. Sadi Konuk Training and Research Hospital, Istanbul, Turkey.
10 Department of Dermatology, Federal State Autonomous Institution, Scientific Center of Children's Health of the Ministry of Health of the Russian Federation, Moscow, Russia.
11 Department of Dermatology, Centro Hospitalar Universitário do Porto, Porto, Portugal.
12 Department of Dermatology, Nicolina Medical Center, P. Poni Institute of Macromolecular Chemistry, Romanian Academy, Iași, Romania.
13 Department of Dermatology, Oxford University Hospitals NHS Trust, Oxford, UK.
14 Department of Paediatric Dermatology, St John's Institute of Dermatology, Guy's and St Thomas' NHS Foundation Trust, London, UK.
15 Unit of Pediatric Dermatology, Department of Dermatology, University of Tours and Nantes, INSERM 1246 SPHERE - CHRU Tours, Tours, France.
16 Department of Dermatology, Hospital Alemán, Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina.
17 Servicio de Dermatología Pediátrica, Hospital General de México Dr. Eduardo Liceaga, Secretaría de Salud, Ciudad de México, Mexico.
18 Department of Dermatology, Hôpital de la Timone, Assistance-Publique-Hôpitaux de Marseille, Marseille, France.
19 St John's Institute of Dermatology, Guy's and St Thomas' NHS Foundation Trust and King's College London, London, UK.
20 Department of Dermatology, Hôpital Saint-Louis, AP-HP, Paris, France.
21 Laboratory of Genetic Skin Diseases, INSERM U1163, Imagine Institute, Université de Paris, Paris, France.