Se Kyung Park, et al. “Changes in Pressure Waves After Endoscopic Intervention in Patients With Achalasia: A Focus on Peristaltic Recovery of the Esophageal Body”. Turkish Journal of Gastroenterology, vol. 27, no. 1, July 2019, pp. 4-9, https://tjg.avesjournals.com/index.php/tjg/article/view/3211.