1. Dept of Obstetrics and Gynecology, University of Wisconsin-Madison, Madison, USA
2. Microbiology Doctoral Training Program, University of Wisconsin-Madison, Madison, USA
3. Dept of Bacteriology, University of Wisconsin-Madison, Madison, USA
4. Dept of Anthropology, University of Wisconsin-Madison, Madison, USA
5. School of Medicine and Public Health, University of Wisconsin-Madison, Madison, USA