Kumar I, Chauhan RS, Verma A. Retrograde gastroesophageal intussusception: an exceedingly rare complication of Heller myotomy in a patient with achalasia cardia. Turkish Journal of Gastroenterology [Internet]. 2017 Jan. 4 [cited 2026 Jan. 1];28(4):316-8. Available from: https://turkjgastroenterol.org/index.php/tjg/article/view/3098