1. Sydney Head and Neck Cancer Institute; Department of Head and Neck Surgery, Chris O'Brien Lifehouse; Sydney New South Wales Australia
2. Department of Oral and Maxillofacial Surgery; Gold Coast University Hospital; Gold Coast Queensland Australia
3. Department of Pathology; Royal Prince Alfred Hospital; Sydney New South Wales Australia
4. Central Clinical School; The University of Sydney; Sydney New South Wales Australia
5. Department of Head and Neck Surgery; Amrita Institute of Medical Sciences; Kochi India