1. CHARC (Copenhagen Heart Arrhythmia Research Center), Department of Medicine B, H: S Rigshospitalet, University of Copenhagen Medical School, 20 Juliane Mariesvej, Copenhagen, DK 2100, Denmark
2. Molecular Diagnostic Laboratory, Department of Clinical Biochemistry, Aarhus University Hospital, Denmark
3. Center for Biological Sequence Analysis, Technical University of Denmark, Lyngby, Kgs 2800, Denmark
4. Department of Pharmacology, Copenhagen University, Copenhagen 2100, Denmark