1. From the Carbohydrate & Lipid Metabolism Research Unit, Department of Medicine (F.J.R., G.J.P., V.R.P.), and the Department of Chemical Pathology (H.E.v.D.), University of the Witwatersrand, Johannesburg, South Africa; and Division of Lipidology, Department of Medicine, University of Cape Town, Cape Town, South Africa (B.C.B., D.J.B., A.D.M.).