1. Department of Chemical and Biomolecular Engineering; College of Engineering, Yonsei University; Seoul 120-749 Republic of Korea
2. BioNanotechnology Research Center; Korea Research Institute of Bioscience and Biotechnology; Daejeon 305-806 Republic of Korea
3. Department of Radiology; College of Medicine, Yonsei University; Seoul 120-752 Republic of Korea
4. Department of Architectural Engineering; Yonsei University; Seoul 120-749 Republic of Korea