| Affiliation: | 1. Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, , Chongqing, China;2. Department of Geriatrics, The third Hospital of Mianyang, , Mianyang, Sichuan, China;3. Department of Geriatrics, Ninth Hospital of Xi'An, , Xi'An, Shanxi, China;4. Laboratory of Stem Cells and Tissue Engineering, Chongqing Medical University, , Chongqing, China;5. Department of Histology and Embryology, Chongqing Medical University, , Chongqing, China;6. Institute of Life Science, Chongqing Medical University, , Chongqing, China;7. Department of Physiology, Chongqing Medical University, , Chongqing, China |
