[1] UNIV HELSINKI,CENT HOSP,DEPT MED 2,SF-00100 HELSINKI,FINLAND
[2] UNIV HELSINKI,CENT HOSP,DEPT RADIOL,HELSINKI,FINLAND
[3] UNIV HELSINKI,DEPT CLIN CHEM,SF-00100 HELSINKI,FINLAND
[4] UNIV HELSINKI,DEPT PATHOL,HELSINKI,FINLAND
[5] UNIV HELSINKI,DEPT BACTERIOL & IMMUNOL,HELSINKI,FINLAND