1 Macquarie Medical School, Faculty of Medicine, Health and Human Sciences, Macquarie University, Sydney, New South Wales, Australia.
2 Department of Otolaryngology-Head and Neck Surgery, Sydney Adventist Hospital, Sydney, New South Wales, Australia.
3 Rhinology and Skull Base Research Group, St Vincent's Centre for Applied Medical Research, University of New South Wales, Sydney, New South Wales, Australia.
4 Department of Otorhinolaryngology-Head and Neck Surgery, Singapore General Hospital, Singapore.
5 Faculty of Medicine, University of Sydney, Sydney, New South Wales, Australia.
6 Department of Otolaryngology, Concord General Hospital, Sydney, New South Wales, Australia.