Khan, Pir Muhammad, Shakeel Khan, and Zafar Hayat. “Endoscopic Interpretation of Symptomatology of Patients With Upper Gastro-Intestinal Problems: A Review of 1390 Cases”. Journal of Postgraduate Medical Institute 6, no. 1 (August 25, 2011). Accessed November 22, 2024. https://jpmi.org.pk/index.php/jpmi/article/view/416.