1. Department of Health Care Organization and Policy, School of Public Health, University of Alabama at Birmingham, Birmingham, Alabama, USA
2. Center for Microbiology Research, Kenya Medical Research Institute, Nairobi, Kenya
3. Departments of Global Health and Obstetrics and Gynecology, University of Washington, Seattle, Washington, USA
4. Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, California, USA
5. School of Nursing, University of Michigan, Ann Arbor, Michigan, USA