[1] Univ Amsterdam, Acad Med Ctr, Ctr Reprod Med, POB 22700, NL-1100 DE Amsterdam, Netherlands
[2] Katholieke Univ Leuven, Dept Dev & Regenerat, Herestr 47, B-3000 Leuven, Belgium
[3] Univ Amsterdam, Acad Med Ctr, Dept Obstet & Gynaecol, POB 22700, NL-1100 DE Amsterdam, Netherlands