[1] ALKO LTD, FINNISH STATE ALCOHOL CO, RES LABS, POB 350, SF-00101 HELSINKI 10, FINLAND
[2] UNIV HELSINKI, DEPT MED 3, SF-00170 HELSINKI 17, FINLAND
[3] UNIV HELSINKI, DEPT MED 2, SF-00170 HELSINKI 17, FINLAND
[4] UNIV HELSINKI, DEPT CLIN CHEM, SF-00170 HELSINKI 17, FINLAND
[5] UNIV HELSINKI, DEPT OBSTET & GYNAECOL, SF-00170 HELSINKI 17, FINLAND