Shrestha, Umid. “Double Pyloric Ostium, an Extremely Rare Endoscopic Finding, in a 62-Year-Old Male Patient Presenting With Melena”. Journal of Advances in Internal Medicine 7, no. 2 (December 31, 2018): 47. Accessed August 7, 2020. https://www.nepjol.info/index.php/JAIM/article/view/23494.