1. Division of Reproductive and Developmental Science, Oregon National Primate Research Center, Beaverton, Oregon 97006;
2. Department of Obstetrics and Gynecology, Oregon Health & Science University, Portland, Oregon 97239;
3. Department of Obstetrics and Gynecology, University of Arizona, Tucson, Arizona 85724;
4. School of Animal and Comparative Biomedical Sciences, University of Arizona, Tucson, Arizona 85721