Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) MITTAL RK,"The crural diaphragm, an external lower esophageal sphincter : A definitive study. Editorial",Gastroenterology,,,1993,105,,1565-1577,https://cir.nii.ac.jp/crid/1574231874457270528,