1. From the Medical Statistics Unit (S.G.T., E.S.), London School of Hygiene and Tropical Medicine, London, UK, and the Departments of Internal Medicine (Cardiology and Angiology) and Institute for Arteriosclerosis Research (C.F., U.H., G.B.) and Internal Medicine (Haematology) (J.C.W. van de L., J.K.), University of Münster, Münster, Germany.