Endoscopic retrograde cholangiopancreatography using a single-balloon enteroscope in patients with altered Roux-en-Y anatomy - Saleem, A.; Baron, T. H.; Gostout, C. J.; Topazian, M. D.; Levy, M. J.; Petersen, B. T.; Wong Kee Song, L. M. (Endoscopy, 2010)