Department of Gastroenterology and Hepatology;
Nagoya University Graduate School of Medicine;
Nagoya 466-8560;
Japan;
Department of Endoscopy;
Nagoya University Hospital;
Nagoya 466-8560;
Japan;
Retrograde cholangiopancreatography; Double-balloon endoscopy; Carbon dioxide insufflation; Anastomosis; Accuracy; Prospective study;