Ofloxacin and Ursodeoxycholic Acid Versus Ursodeoxycholic Acid Alone to Prevent Occlusion of Biliary Stents: A Prospective, Randomized Trial - Halm, U.; Schiefke, I.; Fleig, W. E.; Mössner, J.; Keim, V. (Endoscopy, 2001)