Institution: | 1Department of Radiology, Seoul Municipal Boramae Hospital Affiliated to Seoul National University Hospital, Seoul 156-707, Korea.;2Department of Radiology, Seoul National University College of Medicine, Seoul 110-744, Korea.;3The Institute of Radiation Medicine, Seoul 110-744, Korea.;4Neuroscience Research Institute, Seoul National University Medical Research Center, Seoul 110-744, Korea. |