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) KOWALSKI LP.,Factors influencing contralateral metastasis and prognosis from piriform sinus carcinoma,Am J Surg,,,1995,170,,441-446,https://cir.nii.ac.jp/crid/1574231874437037440,