1. College of Pharmacy, SungKyunKwan University, 300 Chonchon-dong, Jangan-ku,
Suwon City 440-746, Korea
2. Laboratory of Molecular Imaging
and Nanomedicine, NIBIB, NIH, Bethesda,
Maryland 20892, United States
3. College of Pharmacy, Seoul National University, Seoul 151-742, Korea