Maham Abdaal, Numan Ghafoor, Isma Akram, Muhammad Usman, Saqib Hussain, Mehdi Naqvi 2023. Endoscopic Determination of Various Causes of Upper Gastrointestinal Bleeding. Pakistan Journal of Medical & Health Sciences. 16, 12 (Jan. 2023), 183. DOI:https://doi.org/10.53350/pjmhs20221612183.