JAMES, Allwin; KARUNAKARAN, Premkumar; KINI, Ratnakar; THANGAVEL, Pugazhendhi. Patulous upper esophageal sphincter - an unusual endoscopic finding. Turkish Journal of Gastroenterology, [S. l.], v. 29, n. 1, p. 116–118, 2018. DOI: 10.5152/tjg.2018.17189. Disponível em: https://turkjgastroenterol.org/index.php/tjg/article/view/3208. Acesso em: 1 jan. 2026.