Presumed Cryptogenic Liver Disease in Germany: High Prevalence of Autoantibody-Negative Autoimmune Hepatitis, Low Prevalence of NASH, No Evidence for Occult Viral Etiology - Heringlake, S.; Schütte, A.; Flemming, P.; Schmiegel, W.; Manns, M. P.; Tillmann, H. L. (Zeitschrift für Gastroenterologie, 2009)