著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) GRAY DT,Population-based trends in volumes and rates of ambulatory lumbar spine surgery,Spine,,,2006,31,,1957-1963,https://cir.nii.ac.jp/crid/1573105975375238144,