1. Department of Obstetrics, Gynecology, and Reproductive Sciences, Center for Reproductive Sciences, University of California, San Francisco (UCSF), San Francisco, California 94143
2. Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco (UCSF), San Francisco, California 94143
3. Environmental Chemistry Laboratory, Department of Toxic Substances Control, California Environmental Protection Agency, Berkeley, California 94710
4. Department of Neurological Surgery, University of California, San Francisco (UCSF), San Francisco, California 94158