1. Department of Pediatrics, Indiana University School of Medicine , Indianapolis, Indiana , USA
2. Indiana University School of Medicine , Indianapolis, Indiana , USA
3. Department of Paediatrics and Child Health, Faculty of Health Sciences, Empilweni Services and Research Unit, Rahima Moosa Mother and Child Hospital, University of the Witwatersrand , Johannesburg , South Africa
4. Department of Medicine, Albert Einstein College of Medicine , New York, New York , USA
5. CERPOP, SPHERE, Inserm, University of Toulouse , Toulouse , France
6. Faculty of Health Sciences, Centre for Infectious Disease Epidemiology and Research, School of Public Health, University of Cape Town , Cape Town , South Africa
7. Department of Pediatrics, University Houphouet-Boigny , Abidjan , Côte d’Ivoire
8. Department of Medicine, Indiana University School of Medicine , Indianapolis, Indiana , USA
9. Department of Epidemiology, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina , USA