[1] Royal North Shore Hosp, Dept Endocrinol & Diabet, Sydney, NSW, Australia
[2] Univ Sydney, NHMRC Clin Trials Ctr, Sydney, NSW, Australia
[3] Univ Sydney, Northern Clin Sch, Sydney, NSW, Australia
[4] Univ Melbourne, Dept Med St Vincents, Melbourne, Vic, Australia
[5] St Vincents Hosp, Dept Endocrinol & Diabet, Melbourne, Vic, Australia