1. Department of Clinical Biochemistry (N.C.H., K.M.R., R.W., E.M.L.), PathWest Laboratory Medicine, Queen Elizabeth II Medical Centre, Nedlands, Western Australia 6009, Australia;
2. Western Diagnostic Pathology (N.C.H.), Myaree, Western Australia 6154, Australia;
3. School of Pathology and Laboratory Medicine (N.C.H.), Crawley, Western Australia 6009, Australia;
4. Department of Endocrinology and Diabetes (K.M.R., S.J.B., E.M.L, J.P.W.), Sir Charles Gairdner Hospital, Nedlands Western Australia 6009, Australia
5. School of Medicine and Pharmacology (J.P.W.), The University of Western Australia, Crawley, Western Australia 6009, Australia;