1. Department of Laboratory Medicine, University of California, San Francisco, California 94143, United States
2. Program on Reproductive Health and the Environment, Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco, California 94612, United States
3. Department of Epidemiology and Biostatistics, University of California, San Francisco, California 94143, United States
4. School of Molecular Biosciences and Center for Reproductive Biology, Washington State University, Pullman, Washington 99164-7521, United States