Demographics information: age, gender, race, country of birth (COB). Data on liver and virological characteristics: Hepatitis C virus(HCV) genotype, fibrosis stage (F0-4), technology of fibrosis assessment (fibroscan, fibrotest, elastography, biopsy), , cirrhosis (y/n), presence of portal hypertension: esophageal varices, ascites, hepatic encephalopathy, history of decompensation, liver transplantation (y/n).