1. Department of Surgery, St Vincent’s Hospital, 390 Victoria Street, Darlinghurst, NSW 2010, Australia
2. Department of Anatomical Pathology, Westmead Hospital, Cnr Hawkesbury Road & Darcy Road, Westmead, NSW 2145, Australia
3. Department of Otolaryngology, Head and Neck Surgery, Nepean Hospital, Derby Street, Penrith, NSW 2750, Australia
4. Department of Surgery, The Whiteley-Martin Research Centre, Nepean Hospital, Derby Street, Penrith, NSW 2750, Australia