Is It Feasible to Reach the Bypassed Stomach after Roux-en-Y Gastric Bypass for Morbid Obesity? The Use of the Double-Balloon Enteroscope - Sakai, P; Kuga, R; Safatle-Ribeiro, A V; Faintuch, J; Gama-Rodrigues, J J; Ishida, R K; Furuya, C K; Yamamoto, H; Ishioka, S (Endoscopy, 2005)