1 Infectious Diseases Service, Hospital Universitario "Dr. José E. González" and Medical School, Universidad Autónoma de Nuevo León, Monterrey, Mexico.
2 Internal Medicine Department, Hospital Universitario "Dr. José E. González" and Medical School, Universidad Autónoma de Nuevo León, Monterrey, Mexico.
3 Anatomical Pathology and Cytopathology Department, Hospital Universitario "Dr. José E. González" and Medical School, Universidad Autónoma de Nuevo León, Monterrey, Mexico.
4 Infectious Diseases Service, Hospital Universitario "Dr. José E. González" and Medical School, Universidad Autónoma de Nuevo León, Monterrey, Mexico. Electronic address: javier.ramosj@uanl.mx.