Ahmed, H., Farooqi, J. I., Ikramullah, Q., Ahmad, F., Nawaz, M., Gul, S., & Rehman, M. ur. (2011). FREQUENCY OF UPPER GASTROINTESTINAL PATHOLOGIES: LOCAL PERSPECTIVE. Journal of Postgraduate Medical Institute, 20(3). Retrieved from https://jpmi.org.pk/index.php/jpmi/article/view/114