Do normal findings at biliary endoscopic ultrasonography obviate the need for endoscopic retrograde cholangiography in patients with suspicion of common bile duct stone? A prospective follow-up study of 238 patients - Napoleon,B.; Dumortier,J.; Keriven-souquet,O.; Pujol,B.; Ponchon,T.; Souquet,J.C. (Endoscopy, 2003)