1. First Department of Pediatrics; P. & A. Kyriakou Children's Hospital; Athens; Greece
2. Manchester Academic Health Science Centre; NIHR Respiratory and Allergy Clinical Research Facility; The University of Manchester; University Hospital of South Manchester NHS Foundation Trust; Manchester; UK
3. Hans Christian Andersen Children's Hospital; Odense University Hospital; Odense; Denmark
4. Department of Otorhinolaryngology, Head and Neck Surgery; University Hospitals of Leuven; Catholic University of Leuven; Leuven; Belgium
5. Allergy Department; 2nd Pediatric Clinic; University of Athens; Athens; Greece
6. Royal National Throat Nose and Ear; Hospital - Part of UCL Hospitals NHS Foundation Trust; London; UK
7. Nederlands Anafylaxis Netwerk; Dordrecht; the Netherlands
8. Terveystalo Turku; Allergy Clinic; University of Turku; Turku; Finland