1Department of Dermatology, Venereology and Allergy, University Hospital Schleswig-Holstein, Kiel, Germany; 2Imperial College London, National Heart and Lung Institute, London, UK; 3Centre d'tude du Polymorphisme Humain, Fondation Jean Dausset, Paris, France; 4Department of Biostatistics, Harvard School of Public Health, Boston, MA, USA; 5Department of Dermatology and Allergy, University of Bonn, Bonn, Germany; 6Department of Pediatric Pneumology and Allergy, University Children's Hospital Regensburg (KUNO), Regensburg, Germany; 7Dermatology Unit, Department of Medicine Solna, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden; 8Dermatology and Genetic Medicine, College of Life Sciences, and College of Medicine, Dentistry and Nursing, University of Dundee, Dundee, UK; 9Department of Paediatric Dermatology, Our Lady's Children's Hospital, Dublin, Ireland