1. Unit for Laboratory Animal Medicine; University of Michigan; Ann Arbor MI USA
2. Division of Infectious Diseases; Department of Internal Medicine; University of Michigan; Ann Arbor MI USA
3. College of Literature, Science, and the Arts; University of Michigan; Ann Arbor MI USA
4. Department of Microbiology and Immunology; University of Michigan; Ann Arbor MI USA
5. Reproductive Sciences Program; University of Michigan; Ann Arbor MI USA
6. Department of Obstetrics and Gynecology; University of Washington; Seattle WA USA
7. Program on Women's Healthcare Effectiveness Research; Department of Obstetrics and Gynecology; University of Michigan; Ann Arbor MI USA