Evaluation of Fontan's Failure by Classifying the Severity of the Fontan-Associated Liver Disease—A Single-Centre Cross-Sectional Study - Schleiger, A.; Kramer, P.; Salzmann, M.; Danne, F.; Schubert, S.; Bassir, C.; Müller, T.; Tacke, F.; Müller, H.P.; Photiadis, J.; Ovroutski, S. (The Thoracic and Cardiovascular Surgeon, 2021)