1. Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
2. National Center for Immunizations and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
3. National Center for HIV, STD and TB Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA
4. Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, NY, USA
5. Brown University School of Medicine, Providence, RI, USA
6. Johns Hopkins University, Baltimore, MD, USA
7. Wayne State School of Medicine, Detroit, MI, USA
8. National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA, USA