1 Concord Clinical School, University of Sydney, Sydney, New South Wales, Australia; Concord Repatriation General Hospital, Sydney, New South Wales, Australia. Electronic address: dulan@dulangunawardena.com.au.
2 School of Dentistry, University of Sydney, Sydney, New South Wales, Australia; Department of Head and Neck Surgery, Chris O'Brien Lifehouse, Sydney, New South Wales, Australia.
3 Department of Head and Neck Surgery, Chris O'Brien Lifehouse, Sydney, New South Wales, Australia.
4 Concord Clinical School, University of Sydney, Sydney, New South Wales, Australia; Concord Repatriation General Hospital, Sydney, New South Wales, Australia; Department of Head and Neck Surgery, Chris O'Brien Lifehouse, Sydney, New South Wales, Australia.