1. Center for Observational and Real-World Evidence, Merck & Co., Inc., Kenilworth, NJ, USA
2. Instituto Nacional de Salud del Niño (INSN), Breña, Perú
3. Universidad Peruana Cayetano Heredia (UPCH), Lima, Perú
4. Hospital de Niños Ricardo Gutiérrez, Buenos Aires, Argentina
5. St. László Hospital for Infectious Diseases, Budapest, Hungary
6. National Center for Epidemiology, Budapest, Hungary
7. Instituto Nacional de Pediatría, Ciudad de México, México
8. Poznan University of Medical Sciences, Poznan, Poland
9. Global Vaccines Medical Affairs, Merck & Co., Inc., Kenilworth, NJ, USA
10. JSS Medical Research, Montreal, Quebec, Canada