[1] Univ London Imperial Coll Sci Technol & Med, Dept Cardiovasc Med, Natl Heart & Lung Inst, Int Ctr Circulatory Hlth, London W2 1LA, England
[2] Univ Ghent, Dept Publ Hlth, B-9000 Ghent, Belgium
[3] Univ Eastern Finland, Inst Clin Med, Fac Hlth Sci, Kuopio, Finland
[4] Univ Hosp Ctr Zagreb, Dept Internal Med, Zagreb, Croatia
[5] Univ Munster, Inst Epidemiol & Social Med, Munster, Germany