[1] Univ So Denmark, Natl Inst Publ Hlth, DK-1399 Copenhagen K, Denmark
[2] Univ Copenhagen, Glostrup Hosp, Dept Internal Med, Cardiovasc Res Unit, Glostrup, Denmark
[3] Aarhus Univ, Hosp Skejby, Dept Cardiothorac & Vasc Surg, Aarhus, Denmark
[4] Odense Univ Hosp, Dept Cardiothorac & Vasc Surg, DK-5000 Odense, Denmark
[5] Univ So Denmark, Ctr Appl Hlth Serv Res, Odense, Denmark