1 Speciality Registrar ENT, Freeman Hospital, Freeman Road, High Heaton, Newcastle upon Tyne, NE7 7DN, UK.
2 Consultant Microbiologist, Freeman Hospital, Freeman Road, High Heaton, Newcastle upon Tyne, NE7 7DN, UK.
3 Professor of Primary Care, Oxford University, Nuffield Department of Primary Care Health Sciences, Radcliffe Observatory Quarter, Woodstock Road, Oxford. OX2 6GG, UK.
4 Emerita Professor of Otolaryngology, Population Health Sciences Institute, Newcastle University, Baddiley-Clark Building, Richardson Road, Newcastle upon TyneNE2 4AX, UK.