Retrospective Comparison of Initial vs. Subsequent Simultaneous Side-by-Side Stenting with Uncovered Metal Stents during Endoscopic Retrograde Cholangiopancreatography for Unresectable Malignant Hilar Biliary Obstructions. - Koji Takahashi; Hiroshi Ohyama; Motoyasu Kan; Mayu Ouchi; Hiroki Nagashima; Kohichiroh Okitsu; Izumi Ohno; Naoya Kato (Journal of Gastrointestinal & Liver Diseases, 2025)