1. Allergy and Immunology Department; Children's Hospital; Chihuahua City Mexico
2. Clinical Immunology Department; National Institute of Pediatrics; Médica Sur Hospital; Mexico City Mexico
3. Research Methodology Department; Children's Hospital; Chihuahua City Mexico
4. Pediatric Intensive Care Unit; Médica Sur Hospital; Mexico City Mexico
5. Intensive Care Unit; National Institute of Pediatrics; Médica Sur Hospital; Mexico City Mexico
6. Cardiology Department; National Institute of Pediatrics; Médica Sur Hospital; Mexico City Mexico