[1] Univ Helsinki, Dept Clin Chem, Cent Hosp, SF-00100 Helsinki, Finland
[2] St George Hosp, Dept Chem Pathol, London, England
[3] St George Hosp, Dept Cardiol, London, England
[4] Maastricht Univ, Med Ctr, Maastricht, Netherlands
[5] Univ Eastern Finland, Kuopio, Finland
[6] Eastern Finland Lab Ctr, Kuopio, Finland
[7] Univ Innsbruck Hosp, Cent Inst Med, A-6020 Innsbruck, Austria
[8] Univ Innsbruck Hosp, Chem Lab Diagnost, A-6020 Innsbruck, Austria
[9] Aalborg Univ Hosp, Aalborg, Denmark
[10] Univ Zagreb, Zagreb 41000, Croatia
[11] Reg Kliniken Holding RKH GmbH, Inst Lab Med, Ludwigsburg, Germany
[12] Cent Ostrobothnia Hosp Dist, Clin Lab, Kokkola, Finland