The effects of BMMSC treatment on lung tissue degeneration in elderly macaques oleh Yu-kun Yang, Ye Li, Yan-ying Wang, Guang-ping Ruan, Chuan Tian, Qiang Wang, Huan-yu He, Gao-hong Zhu, Dong Fang, Mao Wang, Xiang-qing Zhu, Xing-hua Pan