BISCIT: Biliary interventions in critically ill patients with secondary sclerosing cholangitis—a study protocol for a multicenter, randomized, controlled parallel group trial oleh Klaus Stahl, Friederike Klein, Torsten Voigtländer, Anika Großhennig, Thorsten Book, Tobias Müller, Alexander Wree, Armin Kuellmer, Jochen Weigt, Alexander Dechene, Edris Wedi, Arne Kandulski, Christian M. Lange, Dennis Holzwart, Dorothee von Witzendorff, Kristina I. Ringe, Heiner Wedemeyer, Benjamin Heidrich, for the BISCIT Study group