Frequency of Concurrent Autoimmune Disorders in Patients With Autoimmune Hepatitis: Effect of Age, Gender, and Genetic Background - Bittencourt, Paulo Lisboa; Farias, Alberto Queiroz; Porta, Gilda; Cançado, Eduardo L. R.; Miura, Irene; Pugliese, Renata; Kalil, Jorge; Goldberg, Anna C.; Carrilho, Flair J. (Journal of Clinical Gastroenterology, 2008)