Affiliation: | 1. Department of Radiology, Ansan Hospital, Korea University College of Medicine, 516 Gojan-dong Danwon-gu, Ansan-si, Gyeonggi-do, 425-707, Korea 2. Department of Radiology, Anam Hospital, Korea University College of Medicine, Anam-dong 5ga, Seongbuk-gu, 136-705, Korea
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