xxii Christoph Corin Willers Inselspital Bern, Universitätsklinik für Kinderheilkunde, Dept of Paediatric Respiratory Medicine, Bern, Switzerland corin.willers@insel.ch Hepsi Xavier Child Health, University of Aberdeen, Aberdeen, UK h.xavier.18@aberdeen.ac.uk Sophie Yammine Paediatric Respiratory Medicine, Children’s University Hospital of Bern, University of Bern, Bern, Switzerland sophie.yammine@insel.ch Anna Maria Zicari Paediatric Allergology Service, Dept of Maternal, Infantile and Urological Sciences, Sapienza University, Rome, Italy annamaria.zicari@uniroma1.it Conflicts of interest Disclosures for all authors are given at https://doi.org/10.1183/9781849841313.coi