[1] Univ Med Ctr Utrecht, Dept Obstet, Utrecht, Netherlands
[2] Univ Florida, Dept Physiol & Funct Genom, Gainesville, FL 32611 USA
[3] Univ Florida, Dept Obstet & Gynecol, Gainesville, FL 32611 USA
[4] Univ Melbourne, Dept Zool, Parkville, Vic 3052, Australia