preferred_name: Back pain was measured by the visual analog scale (vas) within three months preoperatively and at three months (6 - 20 weeks) postoperatively
preferred_name_lc: back pain was measured by the visual analog scale (vas) within three months preoperatively and at three months (6 - 20 weeks) postoperatively
label: Back pain was measured by the visual analog scale (vas) within three months preoperatively and at three months (6 - 20 weeks) postoperatively
label_lc: back pain was measured by the visual analog scale (vas) within three months preoperatively and at three months (6 - 20 weeks) postoperatively