1. Johns Hopkins University School of Medicine
2. Department of Gynecology and Obstetrics
3. Division of Infectious Diseases, Department of Medicine
4. Center for Child and Community Health Research, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD
5. Division of Infectious Disease, Wayne State University, Detroit, MI
6. Division of Medical Microbiology, Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD