Reply to Peng & Chow

• References

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• 2 Cheon YK, Lehman GA. Identification of risk factors for stone recurrence after endoscopic treatment of bile duct stones. Eur J Gastroenterol Hepatol 2006; 18: 461-464
• 3 Itoi T, Sofuni A, Itokawa F et al. Evaluation of residual bile duct stones by peroral cholangioscopy in comparison with balloon-cholangiography. Dig Endosc 2010; 22: S85-S89
• 4 Tsuchiya S, Tsuyuguchi T, Sakai Y et al. Clinical utility of intraductal US to decrease early recurrence rate of common bile duct stones after endoscopic papillotomy. J Gastroenterol Hepatol 2008; 23: 1590-1595
• 5 Ang TL, Teo EK, Fock KM, Lyn TanJY. Are there roles for intraductal US and saline solution irrigation in ensuring complete clearance of common bile duct stones?. Gastrointest Endosc 2009; 69: 1276-1281
• 6 Kim HI, Moon JH, Choi HJ et al. Holmium laser lithotripsy under direct peroral cholangioscopy by using an ultra-slim upper endoscope for patients with retained bile duct stones (with video). Gastrointest Endosc 2011; 74: 1127-1132
• 7 Itoi T, Moon JH, Waxman I. Current status of direct peroral cholangioscopy. Dig Endosc 2011; 23 Suppl 1: 154-157
• 8 Moon JH, Ko BM, Choi HJ et al. Direct peroral cholangioscopy using an ultra-slim upper endoscope for the treatment of retained bile duct stones. Am J Gastroenterol 2009; 104: 2729-2733
• 9 Choi HJ, Moon JH, Ko BM et al. Clinical feasibility of direct peroral cholangioscopy-guided photodynamic therapy for inoperable cholangiocarcinoma performed by using an ultra-slim upper endoscope (with videos). Gastrointest Endosc 2011; 73: 808-813