Exploration and discovery of treatment targets for primary biliary cholangitis based on plasma and cerebrospinal fluid proteomics: A multicenter mendelian randomization study - Jianxin Xi; Shengnan Wang; Jie Chen; Jason Chi Shing Law; Jianglong Wang; Guan Huei Lee; Zhongqi Fan; Guoyue Lv; Yuguo Chen (PLoS ONE, 2026)