Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) SHIMADA H,Prognostic significance of CYFRA 21-1 in patients with esophageal squamous cell carcinoma,J Am Coll Surg,,,2003,196,,573-578,https://cir.nii.ac.jp/crid/1571135650386627328,