Efficacy of unilateral hemilaminectomy for intraspinal tumor resection: a systematic review and meta-analysis - Lei, Deqiang; Zhou, Yinchun; Yao, Dongxiao; Zhang, Fangcheng; Wang, Xuan; Jiang, Xiaobing; Xiong, Nanxiang; Zhao, Hongyang (Annals of Palliative Medicine, 2020)