Degenerative changes in adjacent segments after lumbar fixation and fusion: transforaminal endoscopic spine system 
Li Jian-jiang, Chu Ge, Yang Tao, Huang Yi-fei, Wu Yan-sheng, Liu Yan-lu
Chinese Journal of Tissue Engineering Research . 2015, (26): 4186 -4190 .  DOI: 10.3969/j.issn.2095-4344.2015.26.017