1. From the Department of Radiology, Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea (J.-Y.S., D.-C.W., B.W.P., W.H.S., J.K.K.)
2. Bioimaging Research Team, Korea Basic Science Institute, Ochang Cheongwon, Chungbuk, Korea (J.-Y.S., G.C., Y.S., E.K.R.)
3. Medical Research Institute, Gangneung Asan Hospital, Gangwon-do, South Korea (Y.S.C.)
4. Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown (Y.R.K.).