[1] Rigshosp, Dept Cardiol B2142, DK-2100 Copenhagen, Denmark
[2] Glostrup Univ Hosp, Depeartment Med, Glostrup, Denmark
[3] Weill Cornell Med Ctr, Depeartment Cardiol, New York, NY USA
[4] Univ Bergen, Inst Med, Bergen, Norway
[5] Helsinki Univ Hosp, Depeartment Cardiol, Helsinki, Finland
[6] Univ Umeaa, Depeartment Med, Skellefteaa, Sweden
[7] Sahlgrens Univ Hosp, Dept Med, Gothenburg, Sweden