1. Department of Neurology, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China
2. Department of Neurosurgery, Tangdu Hospital, The Fourth Military Medical University, Xi'an, China
3. Department of Cardio-Thoracic Surgery, Kunming General Hospital of Chengdu Military Region, Kunming, China
4. Department of Pathology, The Fourth Military Medical University, Xi'an, China