1. Biomedical Research Center, Korea Institute of Science and Technology, 39-1 Haweolgog-Dong, Sungbook-Gu, Seoul 136-791, South Korea
2. Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH), 31 Center Drive, Suite 1C14, Bethesda, Maryland 20892-2281, United States
3. Department of Chemical Engineering, College of Engineering, Kyung Hee University, Gyeonggi-do 449-701, South Korea
4. Department of Life and Nanopharmaceutical Sciences, Kyung Hee University, Seoul 130-701, South Korea
5. Advanced Medical Technology Cluster for Diagnosis & Prediction, Kyungpook National University, Daeggu 700-422, South Korea
6. Department of Otolaryngology, Asan Medical Center, College of Medicine, University of Ulsan, 388-1 Pungnap-dong, Songpa-gu, Seoul 138-736, South Korea