[1] Gentofte Univ Hosp, Dept Cardiol, Copenhagen, Denmark
[2] Hillerod Sygehus, Dept Cardiol & Endocrinol, Hillerod, Denmark
[3] Odense Univ Hosp, Dept Cardiol, DK-5000 Odense, Denmark
[4] Aarhus Univ Hosp, Dept Cardiol, DK-8000 Aarhus, Denmark
[5] Glostrup Cty Hosp, Dept Internal Med, Copenhagen, Denmark
[6] Univ Copenhagen Hosp, Ctr Heart, Rigshosp, DK-2100 Copenhagen, Denmark