GSTM1 and autoimmune hepatitis: t, Student’s t-test; U, Mann–Whitney U test; χ2: Chi-square test; Hb, hemoglobin; WBCs, white blood cells; ALT, alanine aminotransferase; AST, aspartate aminotransferase; GGT, gamma-glutamyl transferase; PT, prothrombin time; aPTT, activated partial thromboplastin time; INR, international normalized ratio; IgG, immunoglobulin G; GP-73, Golgi protein 73; AIH, autoimmune hepatitis.