1. From Clinical Biochemistry, Western Australian Centre for Pathology and Medical Research (C.M.L.C., J.P.B.), Perth, Western Australia; Sir Charles Gairdner Hospital Campus of the Heart Research Institute of Western Australia (B.M.M., P.L.T., J.H.), Perth; and the School of Medicine and Pharmacology (P.L.T., J.H.), University of Western Australia, Perth.