[1] UNIV OULU,DEPT CLIN CHEM,SF-90220 OULU 22,FINLAND
[2] UNIV OULU,DEPT GYNAECOL & OBSTET,SF-90220 OULU 22,FINLAND
[3] UNIV HELSINKI,DEPT GYNAECOL & OBSTET,SF-00290 HELSINKI,FINLAND
[4] UNIV HELSINKI,DEPT PHYSIOL,SF-00290 HELSINKI,FINLAND
[5] ORGANON SCI DEV GRP,OSS,NETHERLANDS
[6] UNIV KUOPIO,DEPT GYNAECOL & OBSTET,KUOPIO,FINLAND