[1] Royal North Shore Hosp, Dept Endocrine Surg, Northern Sydney Local Hlth Dist, St Leonards, NSW 2065, Australia
[2] Univ Sydney, Fac Med & Hlth, Sydney Med Sch, Camperdown, NSW 2050, Australia
[3] Sir Charles Gairdner Hosp, Endocrine Surg Serv Unit, Hosp Ave, Nedlands, WA 6009, Australia
[4] Univ Western Australia, Sch Med & Surg, Nedlands, WA 6009, Australia
[5] Univ New South Wales, Garvan Inst Med Res, Fac Med, Kinghorn Canc Ctr, Kensington, NSW 2052, Australia