Long-term effects of inorganic osteogenesis-inducing scaffold versus autologous bone in lumbar interbody fusion: protocol for a non-randomized, controlled trial with 2-year follow-up 
Xue Zhixing, Zhou Jianwei, Chi Cheng, Wang Fei, Ma Yuquan
Chinese Journal of Tissue Engineering Research . 2019, (22): 3518 -3521 .  DOI: 10.3969/j.issn.2095-4344.1751