Reply to Matsushita et al.

References

• 1 Double balloon endoscopy. http://www.fujinonendoscopy.com/default.aspx?pageid=125
• 2 Chen Y K, Pleskow D K. SpyGlass single-operator peroral cholangiopancreatoscopy system for the diagnosis and therapy of bile-duct disorders: a clinical feasibility study.  Gastrointest Endosc. 2007;  65 832-841
• 3 Choi H J, Moon J H, Ko B M. et al . Overtube-balloon–assisted direct peroral cholangioscopy by using an ultra-slim upper endoscope [with videos].  Gastrointest Endosc. 2009;  69 935-940