6Bolognesi M,Sacendoti D,Merkel C,et al.Relationship between portal blood flow measured by image directed Doppler ultrasonography and hepatic blood flow measured by indocyanine green constant infusion in patients with cirrhosis.J Clin Ultrasound 1995;23(5):297.
7Bolondi L.Is Doppler US useful for the assessment of portal hyper tension Hepatology 1990;121(10):987.
8Stark ME,Szurszewski JH.Role of nitric oxide in gastro intestinal and hepatic function and disease.Gastroentorology.1992;103:1928.
