1. Department of Anatamy; Chongqing Medical University; Chongqing 400016 China
2. Department of Pathophysiology; Chongqing Medical University; Chongqing 400016 China
3. Laboratory of Stem Cell and Tissue Engineering; Chongqing Medical University; Chongqing 400016 China
4. Chongqing Key Laboratory of Biochemistry and Molecular Pharmacology; Chongqing Medical University; Chongqing 400016 China