Hepatic expression of programmed death-1 (PD-1) and its ligand, PD-L1, in children with autoimmune hepatitis: relation to treatment response - Agina, Hala; Ehsan, Nermine; Abd-Elaziz, Taghreed; Abd-Elfatah, Ghada; Said, Eman; Sira, Mostafa (Clinical and Experimental Hepatology, 2019)