Haris Qadri, Dehadaray A, Kaushik M, Mishra P, Andrabi D. “Achalasia Cardia An Unusual Presentation As a Large Neck Swelling”. The Indian Practitioner, Vol. 67, no. 5, Sept. 2019, pp. 308-10, https://articles.theindianpractitioner.com/index.php/tip/article/view/828.