1. Department of Cardiology, Leiden University Medical Center , Albinusdreef 2, 2333 ZA Leiden , The Netherlands
2. Department of Clinical Epidemiology and Biomedical Data Sciences, Leiden University Medical Center , Leiden , The Netherlands
3. Department of Cardiology, Haaglanden Medisch Centrum , The Hague , The Netherlands
4. Department of Cardiothoracic Surgery, Leiden University Medical Center , Leiden , The Netherlands