1 Department of Pediatrics, Division of Infectious Diseases, Hospital Universitario "Dr. José Eleuterio González", Universidad Autónoma de Nuevo León, Francisco I. Madero Avenue, Mitras Centro, ZC 64460, Monterrey, Mexico.
2 Department of Pediatrics, Division of Infectious Diseases, Hospital Universitario "Dr. José Eleuterio González", Universidad Autónoma de Nuevo León, Francisco I. Madero Avenue, Mitras Centro, ZC 64460, Monterrey, Mexico. Electronic address: [email protected].