KIOSOV, A. Effect of the botulinum toxin injections and endoscopic pneumocardiodilation on symptoms severity and treatment outcomes among patients with primary esophageal sphincter achalasia. Journal of Education, Health and Sport. Online. 20 October 2021. Vol. 11, no. 10, pp. 252-262. [Accessed 26 February 2026]. DOI 10.12775/JEHS.2021.11.10.023.