1. Lazaridis KN, Gores GJ. Cholangiocarcinoma. Gastroenterology. 2005; 128:1655–1667.
2. Korc P, Sherman S. ERCP tissue sampling. Gastrointest Endosc. 2016; 84:557–571.
3. Navaneethan U, Hasan MK, Lourdusamy V, et al. Single-operator cholangioscopy and targeted biopsies in the diagnosis of indeterminate biliary strictures: a systematic review. Gastrointest Endosc. 2015; 82:608–614.
4. Jang S, Stevens T, Kou L, et al. Efficacy of digital single-operator cholangioscopy and factors affecting its accuracy in the evaluation of indeterminate biliary stricture. Gastrointest Endosc. 2020; 91:385–393.
5. de Bellis M, Sherman S, Fogel EL, et al. Tissue sampling at ERCP in suspected malignant biliary strictures (Part 2). Gastrointest Endosc. 2002; 56:720–730.
6. Navaneethan U, Njei B, Lourdusamy V, et al. Comparative effectiveness of biliary brush cytology and intraductal biopsy for detection of malignant biliary strictures: a systematic review and meta-analysis. Gastrointest Endosc. 2015; 81:168–176.
7. Slivka A, Gan I, Jamidar P, et al. Validation of the diagnostic accuracy of probe-based confocal laser endomicroscopy for the characterization of indeterminate biliary strictures: results of a prospective multicenter international study. Gastrointest Endosc. 2015; 81:282–290.
8. Goetz M, Malek NP. Novel triple lumen catheter for ERCP tissue diagnosis. Endosc Int Open. 2018; 6:E984–E988.
9. Onoyama T, Hamamoto W, Sakamoto Y, et al. Peroral cholangioscopy-guided forceps biopsy versus fluoroscopy-guided forceps biopsy for extrahepatic biliary lesions. JGH Open. 2020; 4:1119–1127.
10. Gerges C, Beyna T, Tang RS, et al. Digital single-operator peroral cholangioscopy-guided biopsy sampling versus ERCP-guided brushing for indeterminate biliary strictures: a prospective, randomized, multicenter trial (with video). Gastrointest Endosc. 2020; 91:1105–1113.