1 University of Sydney Endocrine Surgical Unit, Royal North Shore Hospital, Northern Sydney Local Health District, St Leonards, NSW, Australia.
2 Department of Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
3 University of Sydney Endocrine Surgical Unit, Royal North Shore Hospital, Northern Sydney Local Health District, St Leonards, NSW, Australia. marksywak@nebsc.com.au.
4 Northern Clinical School, Sydney Medical School, Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia. marksywak@nebsc.com.au.