Affiliation: | 1Department of Cardiology, Leiden University Medical Center, Albinusdreef 2, P.O. Box 9600, 2300 RC Leiden, the Netherlands ;2Department of Cardiothoracic Surgery, University Medical Center St. Radboud, Geert Grooteplein Zuid 10, P.O. Box 9101, 6500 HB Nijmegen, the Netherlands |