1. Department of Cardiology, Skåne University Hospital, Lund University, SE-221 85 Lund, Sweden
2. Department of Cardiology, Umeå University Hospital, SE-901 89, Umeå, Sweden
3. Department of Clinical Sciences, South Hospital, Arrhythmia Center, Karolinska Institute, SE-118 61, Stockholm, Sweden
4. Department of Cardiology, Uppsala University Hospital, SE-751 85, Uppsala, Sweden
5. Department of Cardiology, Linköping University Hospital, SE-581 85, Linköping, Sweden
6. Department of Cardiology, Karolinska University Hospital, SE-171 76, Solna, Sweden
7. Department of Cardiology, University Hospital Örebro, SE-701 85, Örebro, Sweden
8. Department of Cardiology, Skaraborg Hospital, SE-541 42, Skövde, Sweden
9. Department of Cardiology, Sahlgrenska University Hospital, SE-413 45, Gothenburg, Sweden
10. Thoracic Center, Blekinge County Hospital, S-371 85, Karlskrona, Sweden
11. Department of Cardiology, Norra Älvsborg County Hospital, SE-461 73, Trollhättan, Sweden