[1] St Louis Univ, Sch Med, Edward A Doisy Dept Biochem & Mol Biol, St Louis, MO 63104 USA
[2] Oulu Univ, Dept Surg, Oulu, Finland
[3] Oulu Univ, Dept Anat, Oulu, Finland
[4] Oulu Univ, Dept Pathol, Oulu, Finland
[5] Slovak Acad Sci, Inst Virol, Bratislava, Slovakia