Volkan Öter, Erdal Birol Bostancı, Kerem Karaman, Fatih Sümer, and İlter Özer, “Effects of preoperative endoscopic pneumatic balloon dilatation on postoperative achalasia symptoms after Heller esophageal myotomy plus Dor fundoplication”, Turkish Journal of Gastroenterology, vol. 29, no. 5, pp. 543–548, Jul. 2019.