From the Department of Internal Medicine “B”, Meir General Hospital, Kfar-Saba, Israel (M.H.); Neufeld Cardiac Research Institute, Sheba Medical Center, Tel Hashomer, Israel (M.H., M.B., S.B., H.R.-R., U.G.); Institute for Physiological Hygiene, Wolfson Medical Center, Holen, Israel (D.B., E.G.); and Division of Epidemiology and Preventive Medicine, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel (U.G.). (At 1999-08-03)