Ishan Kumar, Richa Singh Chauhan, & Ashish Verma. (2019). Retrograde gastroesophageal intussusception: an exceedingly rare complication of Heller myotomy in a patient with achalasia cardia. Turkish Journal of Gastroenterology, 28(4), 316–318. Retrieved from https://turkjgastroenterol.avesjournals.com/index.php/tjg/article/view/3418