1 Pediatric Hospital, National Medical Center, Social Security Medical Institute, Ciudad de Mexico, Mexico City, Mexico.
2 Pediatrics Division, Pediatric Hospital, National Medical Center, Social Security Medical Institute, Ciudad de Mexico, Mexico City, Mexico.
3 Infectious Diseases Department, Pediatric Hospital, National Medical Center, Social Security Medical Institute, Ciudad de Mexico, Mexico City, Mexico.
4 Pulmonology Department, Pediatric Hospital, National Medical Center, Social Security Medical Institute, Ciudad de Mexico, Mexico City, Mexico.
5 Hematology Department, Pediatric Hospital, National Medical Center, Social Security Medical Institute, Ciudad de Mexico, Mexico City, Mexico.
6 Infectious Diseases Department and Research Unit in Analysis and Synthesis of Evidence, Social Security Mexican Institute, Ciudad de Mexico, Mexico City, Mexico.