1. Mexican Faculty of Medicine of La Salle University, Mexico City, Mexico
2. Postgraduate Department, School of Higher Education in Medicine, National Polytechnic Institute, Mexico City, Mexico
3. Functional & Stereotactic Neurosurgery & Radiosurgery Service, General Hospital of México, Mexico City, Mexico
4. Physical Medicine & Rehabilitation Service, General Hospital of México, Mexico City, Mexico
5. Faculty of Health Sciences Anahuac University, Mexico City, Mexico
6. Research Direction, General Hospital of Mexico, Mexico City, Mexico