Perbandingan kadar serum alfa-fetoprotein pada pasien karsinoma hepatoselular dengan etiologi infeksi virus hepatitis B atau hepatitis C dan non infeksi virus hepatitis B dan hepatitis C = Comparison of alpha-fetoprotein serum levels in patients with hepatocellular carcinoma with etiology of hepatitis B or hepatitis C virus infection and hepatitis B non-virus and hepatitis C infection