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Seung Hyun Kim, So Eun Kim, Chang Joon Lee, Cheol Keu Kook, Won Seok Choi, Chong Hyun Yoon. "Doppler Sonography of the Kidney: Differentiation of Obstructive and Nonobstructive Hydronephrosis." Journal of the Korean Radiological Society 31.3 (1994) 535