1. Danish National Research Foundation Centre for Cardiac Arrhythmia (DARC); University of Copenhagen; Denmark
2. Laboratory of Molecular Cardiology, Department of Cardiology, The Heart Centre; Copenhagen University Hospital; Rigshospitalet Denmark
3. Department of Medicine and Surgery; Copenhagen University Hospital; Rigshospitalet Denmark
4. Center for Arrhythmia Prevention, Division of Preventive Medicine, Cardiovascular Division, Department of Medicine; Brigham and Women's Hospital, Harvard Medical School; Boston Massachusetts USA