1. Faculty of Medicine, Autonomous University of Coahuila, Torreón, Mexico.
2. Department of Internal Medicine, ISSSTE Regional Hospital of Monterrey, Nuevo León, Mexico.
3. Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud, Monterrey, Mexico.
4. Tecnologico de Monterrey, TecSalud. Laboratorio clínico, Hospital Zambrano Hellion, San Pedro Garza García, Mexico.
5. High Specialty Medical Unit #71, Mexican Institute of Social Security, Torreón, México.
6. Immunology Department, Biomedical Research Center, Autonomous University of Coahuila, Torreon, Mexico.