1. Department of Allergy and Clinical Immunology, Hospital Civil de Guadalajara “Dr. Juan I. Menchaca”, Guadalajara, Jalisco, Mexico
2. Instituto de Salud Pública, Universidad Veracruzana, Xalapa, Veracruz, Mexico
3. Department of Investigation, Hospital Medica Sur, Mexico City, Mexico
4. Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara, Jalisco, Mexico