[1] Sir Charles Gairdiner Hosp, Dept Endocrinol, Nedlands, WA 6009, Australia
[2] Univ Western Australia, Dept Med, Nedlands, WA 6009, Australia
[3] Royal Perth Hosp, Dept Rheumatol, Perth, WA 6001, Australia
[4] Royal Perth Hosp, Dept Pathol, Perth, WA 6001, Australia