Affiliation: | 1. Biomedical Research Center, Korea Institute of Science and Technology, 39‐1 Hawolgok‐dong, Seongbuk‐gu, Seoul 136 791 (Korea), Fax: (+82)?2‐958‐5909;2. Department of Radiology, Seoul National University Hospital, 101 Daehangno, Jongno‐gu, Seoul 110‐744 (Korea);3. Department of Biomedical Engineering and Pharmaceutics, Purdue University, West Lafayette, IN 47906 (USA) |