Non-invasive Evaluation of Liver Fibrosis, Steatosis, and NASH in NAFLD

Inclusion Criteria: * Patients \>19 years age * Patients who had elevated aspartate transaminase(AST)/alanine transaminase(ALT) or fatty liver on abdominal ultrasonography * Patients who are clinically suspected to have nonalcoholic steatohepatitis(NASH): \>40 years age, BMI \>25, multiple features of the metabolic syndrome, presence of diabetes mellitus (DM) , fibroscan \> 6 kilopascal (kPa), platelet count \< 150,000 /ml, and other patients suspected to progress clinically or requiring diagnosis * Patients who underwent (\<6 months) or will undergo US-guided liver biopsy Exclusion Criteria: * Chronic liver disease other than nonalcoholic fatty liver disease(NAFLD) (chronic hepatitis B or C, autoimmune hepatitis, primary biliary cholangitis) * Excessive alcohol consumption (weekly men \>140g and women \>70g) * Fatty liver due to medication * Decompensated liver cirrhosis * Contraindication to magnetic resonance imager(MRI) * Malignancy or other systemic disease * Pregnancy