1. Danish National Research Foundation Centre for Cardiac ArrhythmiaUniversity of Copenhagen Copenhagen Denmark
2. Department of Biomedical SciencesUniversity of Copenhagen Copenhagen Denmark
3. Department of Internal Medicine, Division of CardiologyAmerican University of Beirut Medical Center Beirut Lebanon
4. Department of Biochemistry and Molecular GeneticsAmerican University of Beirut Beirut Lebanon
5. Department of MedicineUniversity of California, San Francisco San Francisco California