1. Department of Neurosurgery, Zhuzhou Central Hospital, Zhuzhou, Hunan 412000, P.R. China
2. Department of Clinical Nursing, The Second Xiangya Hospital of Central South University, Changsha, Hunan 430011, P.R. China
3. Department of Histology and Embryology, School of Basic Medicine Sciences, Xinjiang Medical University, Urumqi, Xinjiang 830017, P.R. China
4. The Key Laboratory of Carcinogenesis and Cancer Invasion of The Chinese Ministry of Education, The Third Affiliated Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China