1. School
of Advanced Materials Engineering, Kookmin University, Seoul 136-702, Korea
2. Department
of Chemistry, Yonsei University, Seoul 120-749, Korea
3. Center
for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Korea
4. School
of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea
5. Institute
of Pharmaceutics, College of
Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, PR China