[1] ST ANNA KLIN,DEPT OBSTET,BERINGEN,NETHERLANDS
[2] CATHOLIC UNIV LEUVEN,CTR HUMAN GENET,B-3000 LOUVAIN,BELGIUM
[3] CATHOLIC UNIV LEUVEN,DEPT GYNAECOL & OBSTET,B-3000 LOUVAIN,BELGIUM
[4] CHU LIEGE,CTR GENET HUMAINE,LIEGE,BELGIUM
[5] INST MORPHOL PATHOL,LOVERVAL,BELGIUM