preferred_name: Back pain was not measured by the visual analog scale (vas) or numeric pain scale at one year (9 to 15 months) postoperatively
preferred_name_lc: back pain was not measured by the visual analog scale (vas) or numeric pain scale at one year (9 to 15 months) postoperatively
label: Back pain was not measured by the visual analog scale (vas) or numeric pain scale at one year (9 to 15 months) postoperatively
label_lc: back pain was not measured by the visual analog scale (vas) or numeric pain scale at one year (9 to 15 months) postoperatively