Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI)
STEFFEE AD,The variable screw placement spinal fixation system : report of a prospective study of 250 patients enrolled in Food and Drug Administration clinical trials,Spine,,,1993,18,,1160-1172,https://cir.nii.ac.jp/crid/1570291225718397312,https://doi.org/10.1097/00007632-199307000-00007