1. Division of Infectious Diseases, Department of Pediatrics, Emory University School of Medicine , Atlanta, Georgia , USA
2. Center for Childhood Infections and Vaccines, Children's Healthcare of Atlanta , Atlanta, Georgia , USA
3. Division of Infectious Diseases, Department of Medicine, Emory University School of Medicine , Atlanta, Georgia , USA
4. Vaccines Medical Development, Scientific and Clinical Affairs, Pfizer, Inc , Collegeville, Pennsylvania , USA