1. Department of Histology and EmbryologyChongqing Medical University Chongqing People's Republic of China
2. Laboratory of Stem Cells and Tissue EngineeringChongqing Medical University Chongqing People's Republic of China
3. Department of PhysiologyChongqing Medical University Chongqing People's Republic of China
4. Department of Geriatrics, The First Affiliated HospitalChongqing Medical University Chongqing People's Republic of China