[1] Univ Helsinki, Dept Clin Chem, SF-00100 Helsinki, Finland
[2] Univ Helsinki, Mol Canc Biol Res Program, Helsinki, Finland
[3] Univ Helsinki, Inst Biomed, Helsinki, Finland
[4] Univ Kuopio, Dept Biosci, FIN-70211 Kuopio, Finland
[5] Univ Kuopio, AIV Inst, FIN-70211 Kuopio, Finland