7BINMOELLER K F.Treatment of difficult bile duct stones using mechanical electrohydranlic and extracopareal shock wave lithotripsy[J].Endoscopy,1993,25:201-206.
8SACKMANN M,HOLL J,SAUTER G H,et al.Extracoporeal shock wave lithotripsy for clearance of bile duct stones resistant to endoscopic extraction[J].Gastrointest Endosc,2001,53:27-32.
9JANIN S K,STEIN R,BHAUVA M,et al.Pigtail stents:an alternative in the treatment of difficult bile duct stones[J].Gastrointest Endosc,2000,52:490-493.
