1. Department of Cardiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark.
2. The Danish National Research Foundation Centre for Cardiac Arrhythmia, Copenhagen, Denmark.
3. Department of Clinical Biochemistry, Herlev Hospital, Copenhagen University Hospital, Copenhagen, Denmark.
4. Department of Clinical Biochemistry, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark.
5. The Laboratory for Molecular Cardiology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark.
6. Department of Surgery and Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark.