1. Department of Cardiology, Leiden University Medical Center , Albinusdreef 2, 2333 ZA Leiden , The Netherlands
2. Department of Cardiology, Presbyterian Hospital/Columbia University Irving Medical Center , 177 Fort Washington Ave, New York, NY 10032 , USA
3. Department of Cardiology III—Adult Congenital and Valvular Heart Disease, University Hospital Muenster , Albert-Schweitzer-Campus 1, Building A1 , Muenster 48149, Germany