Combination therapy of obeticholic acid and ursodeoxycholic acid in patients with primary biliary cholangitis who respond incompletely to ursodeoxycholic acid: a systematic review.

"Conflicts of interest There are no conflicts of interest. All of the authors conceived the study, performed the literature search, quality assessment, and performed the statistical analysis. All of the authors were involved in manuscript writing and preparation. All of the authors have read and approved of the final manuscript."

"This work was supported by the National Natural Science Foundation for Excellent Young Scholars of China (81922012), the National Natural Science Foundation of China (81770583, 81703043), the Natural Science Foundation of Chongqing (cstc2016jcyjA0149), Third Military Medical University (2017MPRC-13) Science Foundation of Outstanding Youth, and Research Foundation of Education Bureau of Hunan Province (17B216). This work was supported by the National Natural Science Foundation for Excellent Young Scholars of China (81922012), the National Natural Science Foundation of China (81770583, 81703043), the Natural Science Foundation of Chongqing (cstc2016jcyjA0149), Third Military Medical University (2017MPRC-13) Science Foundation of Outstanding Youth, and Research Foundation of Education Bureau of Hunan Province (17B216)."