Khaled Ezzedine, Emmanuelle Bourrat, Anette Bygum, Anders Vahlquist, Christine Bodemer, A. Pietrzak, Smail Hadj-Rabia, Judith Fischer, C. Gouveia, Andrea Diociaiuti, Hagen Ott, Juliette Mazereeuw-Hautier, D.G. Paige, A. Audouze, Robert Gruber, Michael C. Rodriguez, Heiko Traupe, Matthias Schmuth, C. Amaro, D. Maier, G. Wehr, Edel A. O'Toole, M. El Hachem, M. Moreen, J.C. Sitek, Daniel Hohl, Ángela Hernández‐Martín, Agneta Gånemo, Vinzenz Oji, Nathalie Jonca, Isabelle Dreyfus, Raman Malhotra, Mateja Dolenc-Voljč, M. Aldwin, P.M. Steijlen, F. Poot, MUMC+: MA Dermatologie (3), Dermatologie, MUMC+: MA AIOS Dermatologie (9), MUMC+: MA Dermatologie (9), RS: GROW - R3 - Innovative Cancer Diagnostics & Therapy, CHU Toulouse [Toulouse], Hospital Infantil Universitario Niño Jesús (HIUNJ), Queen Mary University of London (QMUL), Bart's and The London School of Medicine and Dentistry, Odense University Hospital (OUH), Hospital de Santa Maria [Lisboa], Ichthyosis Support Group, PO Box 1242, Yateley, GU47 7FL, U.K., Association Ichtyose France, Bellerive sur Allier, France., Service de dermatologie [CHU Necker], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-CHU Necker - Enfants Malades [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Imagine - Institut des maladies génétiques (IMAGINE - U1163), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Bambino Gesù Children’s Hospital [Rome, Italy], University Medical Centre Ljubljana [Ljubljana, Slovenia] (UMCL), University of Freiburg [Freiburg], Skane University Hospital [Malmo], Lund University [Lund], Bern University Hospital [Berne] (Inselspital), University of Innsbruck, Centre Hospitalier Universitaire Vaudois [Lausanne] (CHUV), Unité différenciation épidermique et auto-immunité rhumatoïde (UDEAR), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM), Hôpital Henri Mondor, Epidemiology in Dermatology and Evaluation in Therapeutics (EpiDermE), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12), Iuliu Hatieganu University of Medicine & Pharmacy, Queen Victoria Hospital NHS Foundation Trust, Hospital Universitario Son Espases, Children's Hospital 'Auf der Bult', Royal Free Hospital [London, UK], Medical University of Lublin, Oslo University Hospital [Oslo], Maastricht University Medical Centre (MUMC), Maastricht University [Maastricht], University Hospitals Leuven [Leuven], Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Uppsala University, and University Hospital Münster - Universitaetsklinikum Muenster [Germany] (UKM)