1. Centers for Disease Control and Prevention, Atlanta, Georgia;
2. Vanderbilt University School of Medicine, Nashville, Tennessee;
3. University of Utah Health Sciences Center, Salt Lake City;
4. Le Bonheur Children’s Hospital, Memphis,
5. University of Tennessee Health Science Center, Memphis, and
6. Vanderbilt Vaccine Research Program, Nashville, Tennessee;
7. Emory University School of Medicine, Atlanta, Georgia;
8. University of Tennessee Health Science Center/Saint Thomas Health, Nashville;
9. John H. Stroger, Jr Hospital of Cook County, and
10. Rush University Medical Center, Chicago, Illinois;
11. St Jude Children’s Research Hospital, Memphis, Tennessee; and
12. Northwestern University Feinberg School of Medicine, Chicago, Illinois