Hidde M Kroon1, John F Thompson2. 1. Melanoma Institute Australia, The University of Sydney, Sydney, NSW, Australia; Department of General Surgery, The University of Adelaide, Royal Adelaide Hospital, Adelaide, SA, Australia. 2. Melanoma Institute Australia, The University of Sydney, Sydney, NSW, Australia; Discipline of Surgery, The University of Sydney, Sydney, NSW, Australia; Department of Melanoma and Surgical Oncology, Royal Prince Alfred Hospital, Sydney, NSW, Australia. Electronic address: John.Thompson@melanoma.org.au.