1. Department of Clinical Laboratory, The Second Affiliated Hospital of Mudanjiang Medical University, Mudanjiang 157011, Heilongjiang, China
2. Department of Histology and Embryology, Mudanjiang Medical University, Mudanjiang 157011, Heilongjiang, China
3. Department of Neurosurgery, The Fourth Affiliated Hospital of Harbin Medical University, Harbin 150001, Heilongjiang, China
4. Department of Neurology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin 150001, Heilongjiang, China