GPT and fibrosis: AAR, aspartate aminotransferase to alanine aminotransferase ratio; ALT, alanine aminotransferase; ANOVA, analysis of variance; APRI, aspartate aminotransferase to platelet ratio index; AST, aspartate aminotransferase; F0, no fibrosis, F1, mild fibrosis, F2, significant fibrosis, F3, severe fibrosis and F4, cirrhosis; FIB-4, fibrosis-4 score; P, probability; SEM, standard error of the mean