1. Allergy and Clinical Immunology Service, The "Dr. Juan I. Menchaca" Civil Hospital of Guadalajara, Guadalajara, México.
2. Guadalajara Lamar University. Guadalajara, Jalisco, México.
3. UTEG University. Guadalajara, Jalisco, México.
4. Public Health Institute, University of Veracruz. Xalapa, Veracruz, México.