Khan, Rustam, et al. “OUTCOME OF ENDOSCOPIC THERAPEUTIC INTERVENTIONS: ARE THEY DIFFERENT AMONG VARIOUS NON- MALIGNANT ESOPHAGEAL DISEASES”. Journal of Ayub Medical College Abbottabad, vol. 17, no. 4, Sept. 2005, https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/4189.