[1] Leiden Univ, Med Ctr, Dept Cardiol, Leiden, Netherlands
[2] Policlin San Matteo, IRCCS, I-27100 Pavia, Italy
[3] Univ Ghent, B-9000 Ghent, Belgium
[4] Erasmus Univ, Dept Epidemiol & Stat, Rotterdam, Netherlands
[5] Interuniv Cardiol Inst Netherlands, Utrecht, Netherlands