1. Ireland National University, Medical School, Galway, Ireland
2. INUB–MEDITECH, Research Group, Universidad El Bosque, Bogotá, Colombia
3. Hull York Medical School, Medicine Program, Heslington, England
4. Universidad Surcolombiana, Facultad de Salud, Neiva, Colombia
5. Maracay Central Hospital, Neurosurgery Service, Aragua, Venezuela
6. Meditech Foundation, Clinical Research Division, Cali. Colombia
7. ValleSalud Clinic, Neurosurgery Service, Cali, Colombia