Affiliation: | 1. Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Pungnap 2-dong, Songpa-gu, Seoul, 138-736, Korea 2. Department of Radiology, Eulgi Medical Center, 280-1, Hagye-dong, Nowon-gu, Seoul, 139-711, Korea 3. Department of Medical Imaging, Toronto General Hospital, 200 Elizabeth St, Toronto, Ontario, Canada, M5G2C4 4. Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, 388-1, Pungnap 2-dong, Songpa-gu, Seoul, 138-736, Korea 5. Department of Radiology, Yong Dong Severance Hospital, 146-92 Dokok-dong, Kangnam-ku, Seoul, 137-270, Korea
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