A randomized trial of obeticholic acid monotherapy in patients with primary biliary cholangitis by Kowdley, K, Luketic, V, Chapman, R, Hirschfield, G, Poupon, R, Schramm, C, Vincent, C, Rust, C, Parés, A, Mason, A, Marschall, H, Shapiro, D, Adorini, L, Sciacca, C, Beecher-Jones, T, Böhm, O, Pencek, R, Jones, D, Obeticholic Acid Pbc Monotherapy Study Group