Asmaa Elzeftawy; Loai Mansour; Abdelrahman Kobtan; Heba Mourad; Ferial El-Kalla. Evaluation of the Blood Ammonia Level As a Non-Invasive Predictor for the Presence of Esophageal Varices and the Risk of Bleeding. Turkish Journal of Gastroenterology 2019, 30, 59-65.