From the Division of Public Health Research (D.K.), National Institute of Public Health and the Environment, Bilthoven, the Netherlands; Association for Cardiac Research (A.M.), Rome, Italy; University of Leuven (H.K.), Department of Epidemiology, Faculty of Medicine, Leuven, Belgium; and Programa Cronicat (S.S.), Institute of Health Studies, Hospital de Sant Pau, Barcelona, Spain. (At 2002-02-19)