1. Sección de posgrado, Escuela Superior de Medicina IPN, Mexico City, Mexico
2. School of Medicine, Autonomous University of Sinaloa, Culiacan, Sinaloa, Mexico
3. Pediatric Hospital of Sinaloa, Culiacan, Sinaloa, Mexico
4. Programa Regional Para el Doctorado en Biotecnología, FCQB-UAS, Culiacán, Sinaloa, México
5. The Sinaloa State Public Health Laboratory, Secretariat of Health, Culiacan, Sinaloa, Mexico