1. Division of Reproductive and Developmental Sciences, Oregon National Primate Research Center, 505 NW 185th Avenue, Beaverton, OR 97006, USA
2. Department of Obstetrics and Gynecology, Sapporo Medical University, South 1 West 16, Sapporo, Hokkaido 060-8543Japan
3. Department of Obstetrics and Gynecology, School of Medicine, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA