1. Department of Histology and Embryology, Chongqing Key Laboratory of Neurobiology; Army Medical University (Third Military Medical University); Chongqing 400038 China
2. Department of Orthopedics; The Secondary Affiliated Hospital, Guilin Medical University; Guangxi 541100 China
3. Department of Neurology; Affiliated Hospital of Academy of Military Medical Sciences; Beijing 100071 China