1 Department of Pediatrics, Turku University Hospital and University of Turku, Turku, Finland.
2 Department of Parasitology, Leiden University Medical Center, Leiden, The Netherlands.
3 COPSAC, Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Copenhagen, Denmark.
4 Department of Pediatric Allergy and Immunology, Istanbul Medeniyet University Medical Faculty Göztepe Training and Research Hospital, Istanbul, Turkey.
5 Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden.
6 Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden.
7 Department of Medicine Solna, Immunology and Allergy Unit, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.
8 Imperial College Healthcare NHS Trust, London, UK.
9 Allergy Department, 2nd Pediatric Clinic, University of Athens, Athens, Greece.
10 Division of Infection, Immunity & Respiratory Medicine, University of Manchester, Manchester, UK.
11 Department of Pediatrics, Medical University of Warsaw, Warsaw, Poland.
12 Department of Pediatric Pneumonology and Allergy, Medical University of Warsaw, Warsaw, Poland.
13 Pediatric Allergology, Department of Pediatrics, University Hospital, German Center for Lung Research (DZL), Dr. von Hauner Children's Hospital, LMU, Munich, Munich, Germany.
14 Centre for Inflammation Research, Queen's Medical Research Institute and Child Life and Health, University of Edinburgh, Edinburgh, UK.