Efficacy Of Ercp For Difficult Bile Duct Stone Clearance: Endoscopic Papillary Balloon Dilation With Stent Versus Stent - Alburquerque, M; Zaragoza, N; Miguel, I; Figa, M; Pijoan, E; Miñana, JM; Vargas, A; Torres, G; Reñe, JM; González-Huix, F; SEED Working Group on ERCP (Endoscopy, 2021)