Department of Pediatrics, New York-Presbyterian/Weill Cornell Medical Center, New York, New York, USA;3. Child and Adolescent Health Unit, Faculty of Medicine and Health Sciences, University of Zimbabwe, Harare, Zimbabwe;4. Department of Pediatrics, University of California Irvine, Irvine, California, USA

Department of Pediatrics, Children's Hospital of Orange County, Orange, California, USA;5. Department of Pediatrics, Duke University Medical Center, Durham, North Carolina, USA

Duke Human Vaccine Institute, Durham, North Carolina, USA;6. Division of Epidemiology and Biostatistics, School of Public Health & Family Medicine, University of Cape Town, Cape Town, South Africa;7. Department of Health Policy and Management, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA;8. CERPOP, Inserm, Toulouse University, Université Paul Sabatier, Toulouse, France;9. Department of Pediatrics, University of Colorado Anschutz Medical Campus and Children's Hospital Colorado, Aurora, Colorado, USA;10. Medical Practice Evaluation Center, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA

Division of Infectious Diseases, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA

Harvard Medical School, Boston, Massachusetts, USA