Corrigendum: Clinical efficacy of unilateral laminotomy for bilateral decompression in the treatment of adjacent segment disease after lumbar fusion - Yun Xu; Yang Liu; Ding Ding; Bin Ru; Quan Wan; Zhongwei Ji; Wenlong Liu; Ran Guo; Jiaqi Hu; Nannan Zhang; Langhai Xu; Shun Li; et al. (Frontiers in Surgery)