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Quantitative measurement of portal blood flow in patients with chronic liver disease using an ultrasonic duplex system consisting of a pulsed doppler flowmeter and B-mode electroscanner[J] . Fuminori Moriyasu,Nobuyuki Ban,Osamu Nishida,Takefumi Nakamura,Shunzo Koizumi,Masahiko Sakai,Yuzo Kanematsu,Takeo Miyake,Haruto Uchino.Gastroenterologia Japonica . 1984 (6)