1. Immunology Service at the Hospital de Especialidades UMAE 25 del IMSS Monterrey Mexico
2. Hematology Department at the Hospital de Especialidades UMAE 25 del IMSS Monterrey Mexico
3. Pediatrics Service at the Hospital de Especialidades UMAE 25 del IMSS Monterrey Mexico
4. Infectious Disease Department at the Hospital de Especialidades UMAE 25 del IMSS Monterrey Mexico
5. Immune deficiencies lab at the National Institute of Pediatrics Mexico City Mexico