1. Department of Neurosurgery, Tianjin Medical University General Hospital, China (Y.Y., B.W., C.P., Y.Z., J.L., J.Z., X.Y.).
2. Department of Neurosurgery, Xingtai People’s Hospital, China (X.G., Z.L.).
3. Department of Neurosurgery, The First People’s Hospital of Jining, Jining Medical University, China (W.L., L.F.).
4. Laboratory of Epidemiology, Tianjin Medical University General Hospital & Tianjin Neurological Institute, China (J.W.).
5. Department of Geriatrics, Tianjin Medical University General Hospital, China (P.L.).