1. Department of Pediatrics, Hospital de Niños Exequiel González Cortés, Facultad de Medicina, Universidad de Chile, Santiago, Chile
2. Department of Pediatrics, Santa Casa de São Paulo School of Medical Sciences, São Paulo, Brazil
3. Department of Epidemiology and Public Health, Universidad de Los Andes, Santiago, Chile
4. Department of Pediatrics, Hospital Luis Calvo Mackenna, Facultad de Medicina, Universidad de Chile, Santiago, Chile
5. Bristol Children's Vaccine Centre, Schools of Cellular and Molecular Medicine and Population Health Sciences, University of Bristol, United Kingdom
6. Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
7. Instituto Milenio de Inmunología e Inmunoterapia, Facultad de Medicina, Universidad de Chile, Santiago, Chile