Nishio R, Kawashima H, Nakamura M, Ohno E, Ishikawa T, Yamamura T, Maeda K, Sawada T, Tanaka H, Sakai D, Miyahara R, Ishigami M, Hirooka Y, Fujishiro M. Double-balloon endoscopic retrograde cholangiopancreatography for patients who underwent liver operation: A retrospective study. World J Gastroenterol 2020; 26(10): 1056-1066 [PMID: 32205996 DOI: 10.3748/wjg.v26.i10.1056]