1. evidENT, Ear Institute, University College London, London, United Kingdom
2. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, the Netherlands
3. Department of Otolaryngology–Head and Neck Surgery, Assaf Harofeh Medical Center, Faculty of Medicine, Tel Aviv University, Zerifin, Israel
4. Royal National Throat Nose and Ear Hospital, London, United Kingdom
5. Division of Pediatric Otolaryngology, Children’s Hospital of Pittsburgh of UPMC, Department of Otolaryngology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
6. Department of Otolaryngology, School of Paediatrics and Child Health, The University of Western Australia, Nedlands, WA, Australia
7. Department of Clinical Sciences, Division of Otorhinolaryngology, Head and Neck Surgery, Lund University Hospital, Lund, Sweden
8. University Hospitals Bristol NHS Foundation Trust and School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom
9. Pediatric Highly Intensive Care Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy
10. Department of Pediatrics, University of Turku, Turku, Finland