1. Institute of Life Science; Chongqing Medical University; Chongqing People's Republic of China
2. Department of Histology and Embryology; Chongqing Medical University; Chongqing People's Republic of China
3. Department of Pediatric Surgical Oncology; Children's Hospital of Chongqing Medical University; Chongqing People's Republic of China
4. Laboratory of Stem Cells and Tissue Engineering; Chongqing Medical University; Chongqing People's Republic of China
5. Department of Geriatrics; the First Affiliated Hospital of Chongqing Medical University; Chongqing People's Republic of China
6. Department of Physiology; Chongqing Medical University; Chongqing People's Republic of China