1. Department of Physiology, Maastricht University, PO Box 616, 6200 MD Maastricht, the Netherlands
2. The Hull Family Cardiac Fibrillation Management Laboratory, Toronto General Hospital, University Health Network, 200 Elizabeth Street, Toronto, Ontario M5G 2C4, Canada
3. Department of Biomedical Engineering, Maastricht University, PO Box 616, 6200 MD Maastricht, the Netherlands