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Semi-quantitative Assessment of Collateral Flow Through the Circle of Willis by Contrast-enhanced Transcranial Doppler Ultrasonography(TCD): Comparison with Digital Subtraction Angiography(DSA).
Young Jun Lee, Tae Sub Chung, Jin Yang Joo, Myung Sik Lee
J Korean Soc Med Ultrasound. 1998;17(4):365-373. Published online January 1, 2001
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