1. Department of Neurosurgery, Xuanwu Hospital, Capital Medical University and China International Neuroscience Institute (China-INI), Beijing (J.L., T.W., R.X., H.G., X.Z., J.W., R.Y., P.G., Y.M., L.J.).
2. Department of Evidence-based Medicine (K.Y.), Beijing, China.
3. Capital Medical University, Beijing, China (X.W.).
4. Medical Library of Xuanwu Hospital, Xuanwu Hospital, Capital Medical University, Beijing, China (X.W.).