1. Department of Neurology, Xuan Wu Hospital of Capital Medical University, Beijing 100053, China
2. Department of Neurosurgery, Xuan Wu Hospital of Capital Medical University, Beijing 100053, China
3. Evidence-Based Medicine Center, Xuan Wu Hospital of Capital Medical University, Beijing 100053, China
4. Department of Neurology, Wangjing Hospital, China Academy of Chinese Medical Sciences, Beijing 100102, China
5. Department of Neurological Surgery, Wayne State University School of Medicine, Detroit, MI 48201, USA