[1] Univ Copenhagen, Gentofte Hosp, Dept Cardiol, DK-2900 Copenhagen, Denmark
[2] Univ Copenhagen, Fac Hlth & Med Sci, DK-2900 Copenhagen, Denmark
[3] Univ Southern Denmark, Natl Inst Publ Hlth, Copenhagen, Denmark
[4] Copenhagen Univ Hosp, Rigshosp, Ctr Heart, Dept Cardiol, Copenhagen, Denmark
[5] Duke Univ, Med Ctr, Duke Clin Res Inst, Durham, NC USA