A comparative study on the application of different endoscopic diagnostic methods in the differential diagnosis of benign and malignant bile duct strictures oleh Liang Zhu, Liang Zhu, Zhi-Quan Huang, Zhen-Wen Wang, Xue-Ping Yang, Jun-Bo Hong, Jun-Bo Hong, Zhen-Zhen Yang, Zhen-Zhen Yang, Zheng-Ping Yu, Rong-Lai Cao, Jin-Li He, You-Xiang Chen, You-Xiang Chen