1. Xuanwu Hospital, Capital Medical University; Department of Neurosurgery; No. 45 Changchun Street Beijing China 100053
2. Xuanwu Hospital, Capital Medical University; Department of Evidence-based Medicine; No. 45 Changchun Street Beijing China 100053
3. Xuanwu Hospital, Capital Medical University; Medical Library of Xuanwu Hospital; No. 45 Changchun Street Beijing China 100053
4. CentraCare Health System; Neurosciences - Stroke and Cerebrovascular; 1406 Sixth Ave North St Cloud Minnesota USA
5. Beijing Obstetrics and Gynecology Hospital, Capital Medical University; Department of Anesthesiology; Beijing China