1. Division of Cardiology, Rigshospitalet, Copenhagen University , Blegdamsvej 9, DK 2100 Copenhagen , Denmark
2. Division of Cardiology, Herlev and Gentofte Hospital, Copenhagen University , Hospitalsvej 4, DK 2900 Hellerup , Denmark
3. Copenhagen Emergency Medical Services, Copenhagen University , Telegrafvej 5, Opgang 2, 2nd floor, DK 2750 Ballerup , Denmark
4. Department of Clinical Medicine, University of Copenhagen , Blegdamsvej 3B, DK 2200 Copenhagen , Denmark
5. Deparment of Cardiology, Nordsjællands Hospital , Dyrehavevej 29, DK 3400 Hillerød , Denmark
6. Department of Public Health, University of Copenhagen , Øster Farimagsgade 5, DK 1353 Copenhagen , Denmark