The efficacy of peroral cholangioscopy for difficult bile duct stones and indeterminate strictures: a systematic review and meta-analysis.
Korrapati P, Ciolino J, Wani S, Shah J, Watson R, Muthusamy VR, Klapman J, Komanduri S. The efficacy of peroral cholangioscopy for difficult bile duct stones and indeterminate strictures: a systematic review and meta-analysis. Endosc Int Open. 2016 Mar; 4(3):E263-75.