Clinical Trials as Topic Diseases General MEDICAL Maladies Nervous System Diseases Nervous system Neurochirurgie Neurosurgery Neurosurgical Procedures Surgery Système nerveux Analytical, Diagnostic and Therapeutic Techniques and Equipment Chirurgie opératoire Delivery of Health Care Disciplines and Occupations Disease Environment and Public Health Epidemiologic Methods Epidemiologic Study Characteristics as Topic Evaluation Studies as Topic Health Care Evaluation Mechanisms Health Care Quality, Access, and Evaluation Health Occupations Investigative Techniques Medical care Medical personnel Medicine Methodology Methods