[1] Leiden Univ, Med Ctr, Dept Cardiol, NL-2300 RC Leiden, Netherlands
[2] Univ Ghent, Dept Cardiol, B-9000 Ghent, Belgium
[3] AZ Maria Middellares, Dept Cardiol, Ghent, Belgium
[4] Erasmus Univ, Ctr Thorax, Dept Cardiol, NL-3000 DR Rotterdam, Netherlands