Stem cell transplantation improves bone mass: research progress and application prospects 
Cao De-yu, Li Feng, Qi Bao-chang, Gu Qun, Wang Chun-li, Tao Shu-qing
Chinese Journal of Tissue Engineering Research . 2014, (45): 7348 -7352 .  DOI: 10.3969/j.issn.2095-4344.2014.45.024