Zahid Ullah M, Shah SA, Khan ZA, Irshad K. Transthoracic Heller’s Myotomy for Achalasia of Cardia Experience with 28 Patients. J Postgrad Med Inst [Internet]. 2011 Sep. 8 [cited 2024 Nov. 23];12(1). Available from: https://jpmi.org.pk/index.php/jpmi/article/view/601