Carpino, G., A. Franchitto, V. Cardinale, D. Alvaro, T. H. Karlsen, and E. Gaudio. “Biliary Tree Stem Cells Are Involved in the Pathogenesis of Primary Sclerosing Cholangitis”. Italian Journal of Anatomy and Embryology, vol. 121, no. 1, Oct. 2017, p. 157, https://oajournals.fupress.net/index.php/ijae/article/view/2295.