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UNIV SO CALIF, CLIN RES CTR,DIV ULTRASOUND,DEPT RADIOL, DIV GASTROINTESTINAL & LIVER DIS, LOS ANGELES, CA 90033 USA UNIV SO CALIF, CLIN RES CTR,DIV ULTRASOUND,DEPT RADIOL, DIV GASTROINTESTINAL & LIVER DIS, LOS ANGELES, CA 90033 USA