^a Department of Pediatrics and Adolescent Medicine, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, University Teaching Hospital in Martin, Martin, Slovakia 

^b Department of Pulmonology and Phthisiology, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, University Teaching Hospital in Martin, Martin, Slovakia 

^c Institute of Clinical Immunology and Medical Genetics, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, University Teaching Hospital in Martin, Martin, Slovakia 

^d Univ Groningen, Univ Med Ctr Groningen, Dept Clin Pharm & Pharmacol, Groningen, the Netherlands 

^e KU Leuven, Catholic University of Leuven, Dept Microbiology Immunology & Transplantation, Belgium 

^f First Faculty of Medicine, Charles University and Thomayer Hospital, Department of Respiratory Medicine, Prague, Czech Republic 

^g Escuela de Doctorado UAM, Centro de Estudios de Posgrado, Universidad Autónoma de Madrid. Calle Francisco Tomás y Valiente, n° 2. Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain 

^h Allergy and Clinical Immunology Research Unit, Department of Microbiology and Immunology, KU Leuven, Leuven, Belgium 

ⁱ Servicio de Alergia, Hospital Universitario Ramón y Cajal, Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), University of Alcalá (UAH), Madrid, Spain 

^j Department of Otorhinolaryngology, Head & Neck Surgery, and Audiology, Rigshospitalet, Copenhagen University, Copenhagen, Denmark 

^k Department of Respiratory Medicine & Allergology, Institute for Clinical Science, Skane University Hospital, Lund University, Lund, Sweden 

^l Department of Pediatric Pneumonology and Allergy, Medical University of Warsaw, Warsaw, Poland 

^m Laboratory of Upper Airways Research, Department of Otorhinolaryngology, University of Ghent, Ghent, Belgium 

ⁿ Allergy and Clinical Immunology Research Unit, KU Leuven Department of Microbiology and Immunology, Leuven, Belgium 

^o Clinical Department of Otorhinolaryngology, Head and Neck Surgery, University Hospitals Leuven, Leuven, Belgium 

^p HUS Hyvinkää Hospital, Hyvinkää, Finland 

^q Clinical and Experimental Sciences and Human Development and Health, Faculty of Medicine, University of Southampton, Southampton, United Kingdom 

^r NIHR Southampton Biomedical Research Centre, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom 

^s HUS Skin and Allergy Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland 

^t Allergy Department, Second Pediatric Clinic, National and Kapodistrian University of Athens, Athens, Greece 

^u Lydia Becker Institute, University of Manchester, Manchester, United Kingdom 

^v Immuno-Allergy Department, CUF Tejo Hospital, Lisbon, Portugal 

^w NOVA Medical School, Universidade Nova de Lisboa, Lisbon, Portugal 

^x Department of Paediatrics, Second Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic 

^y Department of Allergy, Hospital Universitario La Paz, IdiPAZ, Madrid, Spain 

^z Department of Paediatric Pulmonology and Phthisiology, Faculty of Medicine, Slovak Medical University, National Institute of Children's Diseases, Bratislava, Slovakia 

^aa Department of Allergy & Rhinology, Royal National ENT Hospital, London, United Kingdom 

^ab Division of Immunity and Infection, University College, London, United Kingdom 

^ac Department of Pediatrics, Medisch Spectrum Twente, Enschede, the Netherlands 

^ad Department of Pediatric Respiratory Medicine, Immunology and Critical Care Medicine, Charité Universitätsmedizin Berlin, Berlin, Germany