Endoscopic Bilateral Stent-in-Stent Versus Stent-by-Stent Deployment in Advanced Malignant Hilar Obstruction: A Meta-Analysis and Systematic Review. - Shim SR; Lee TH; Yang JK; Kim JH; Lee YN; Cha SW; Moon JH; Cho YD; Park SH (Digestive diseases and sciences, 2022)