1. Department of Cardiology and Experimental Cardiology, Heart Failure Research Centre; Academic Medical Centre; Amsterdam Netherlands
2. Department of Genetics; University Medical Centre Utrecht; Utrecht the Netherlands
3. Department of Cardiology; University Medical Centre Groningen, University of Groningen; Groningen the Netherlands
4. Department of Obstetrics and Gynaecology; University Medical Centre Groningen, University of Groningen; PO Box 30001, 9700 RB Groningen the Netherlands
5. Department of Genetics; University Medical Centre Groningen, University of Groningen; Groningen the Netherlands