1. Department of Anatomy and Neurobiology, School of Basic Medical Science, Central South University, Changsha 410013, China
2. Clinical Medicine Eight-year Program, 02 Class, 17 Grade, Xiangya School of Medicine, Central South University, Changsha 410013, China
3. Department of Human Anatomy, School of Basic Medical Science, Xinjiang Medical University, Urumqi 830001, China