1 Paediatric ENT Department, Royal Manchester Children's Hospital, Manchester University NHS Foundation Trust, Manchester, United Kingdom.
2 Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom.
3 Manchester Centre for Audiology and Deafness (ManCAD), School of Health Sciences I Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom.