[1] Erasmus MC, Dept Cardiol, NL-3015 GD Rotterdam, Netherlands
[2] Univ Munster, Inst Epidemiol & Social Med, D-4400 Munster, Germany
[3] Univ Ghent, Dept Publ Hlth, B-9000 Ghent, Belgium
[4] Univ Kuopio, Dept Med, FIN-70211 Kuopio, Finland
[5] Univ Padua, CNR, Unit Muscle Pathophysiol, Padua, Italy
[6] Osped S Maria Misericordia, Dept Cardiol, Ctr Cardiovasc Dis, Udine, Italy
[7] Inst Hlth Studies, Dept Hlth Social Security, Barcelona, Spain
[8] Natl Heart & Lung Inst, Dept Clin Epidemiol, London, England