1Kim MH, Lee SK, Lee MH, et al. Endoscopic retrograde cholangiopanereatogrephy and needle - knife sphineteretomy in patients with Billroth Ⅱ gastrectomy: a comparative study of the forward-viewing endoscope and the side - viewing duodenoscope. Endoscopy, 1997,29:82-85.
2Bergman JJ,van Berkel AM, Bruno M J, et al. A randomized trial of endoscopic balloon dilation and endoscopic sphincterotomy for removal of bile duct stones in patients with a prior Billroth Ⅱ gastrectomy.Gestrointest Endosc ,2001,53 : 19-26.
