1. School of Medicine and Science Health, Tecnologico de Monterrey, Monterrey, Nuevo Leon Mexico.
2. Research and Teaching Department, Hospital Clinica Nova de Monterrey, San Nicolas de los Garza, Nuevo Leon Mexico.
3. Medical Specialties, School of Medicine, Universidad de Monterrey, San Pedro Garza Garcia, Nuevo Leon, Mexico.
4. Quality Management Department, Hospital Clinica Nova de Monterrey, San Nicolas de los Garza, Nuevo Leon Mexico.