1. School of Public Health, Oregon Health and Science University , Portland, Oregon , USA
2. Department of Pediatrics, Emory University School of Medicine , Atlanta, Georgia , USA
3. Department of Medicine, Emory University School of Medicine , Atlanta, Georgia , USA
4. Center for Childhood Infections and Vaccines, Children’s Healthcare of Atlanta, Emory University , Atlanta, Georgia , USA
5. Department of Epidemiology, Rollins School of Public Health, Emory University , Atlanta, Georgia , USA
6. Department of Biostatistics and Bioinformatics, Rollins School of Public Health, Emory University , Atlanta, Georgia , USA