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) DUPONT WD,PS power and sample size program available for free on the Internet,Control Clin Trials,,,1997,18,,274,https://cir.nii.ac.jp/crid/1570009750952132608,