Can early precut implementation reduce endoscopic retrograde cholangiopancreatography-related complication risk? Meta-analysis of randomized controlled trials - Cennamo, V.; Fuccio, L.; Zagari, R. M.; Eusebi, L. H.; Ceroni, L.; Laterza, L.; Fabbri, C.; Bazzoli, F. (Endoscopy, 2010)