1. Department of Epidemiology and Population Health, Albert Einstein College of Medicine, Bronx, New York.
2. Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois.
3. Department of Obstetrics/Gynecology, Washington University School of Medicine, St. Louis, Missouri.
4. Department of Obstetrics/Gynecology, Maimonides Medical Center, Brooklyn, New York.
5. Department of Epidmiology, Johns Hopkins School of Public Health, Baltimore, Maryland.
6. Department of Pathology, City of Hope National Medical Center, Duarte, California.
7. Department of Obstetrics/Gynecology, Georgetown University Medical Center, Washington, District of Columbia.
8. Department of Pediatrics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, Maryland.
9. Department of Medicine, University of California San Francisco, San Francisco, California.