TGFB1 and hepatitis C virus infection: (TITLE-ABS-KEY("Transforming Growth Factor beta1") OR TITLE-ABS-KEY("TGF-beta1")) AND (TITLE-ABS-KEY("Polymorphism") OR TITLE-ABS-KEY("SNP") OR TITLE-ABS-KEY("Genetic Variation")) AND (TITLE-ABS-KEY("Hepatitis C") OR TITLE-ABS-KEY("HCV")) AND (TITLE-ABS-KEY("Cirrhosis") OR TITLE-ABS-KEY("Liver Cirrhosis") OR TITLE-ABS-KEY("Liver Fibrosis") OR TITLE-ABS-KEY("Hepatic Fibrosis") OR TITLE-ABS-KEY("Hepatic Cirrhosis"))