Shahbazkhani, Bijan, et al. “Dilated Common Bile Duct Unexplained on Transabdominal Ultrasonography; The Role of Endoscopic Ultrasonography and Predictors of Malignancy”. Researcher Bulletin of Medical Sciences, vol. 22, no. 1, Sept. 2018, p. e7, https://journals.sbmu.ac.ir/index.php/rbms/article/view/22655.