[1] Natl Hlth Res Inst, Ctr Nanomed Res, Zhunan 350, Miaoli, Taiwan
[2] Natl Hlth Res Inst, Div Med Engn Res, Zhunan 350, Miaoli, Taiwan
[3] Natl Chi Nan Univ, Dept Appl Chem, Puli 545, Nantou, Taiwan
[4] Natl Chi Nan Univ, Grad Inst Biomed & Biomed Technol, Puli 545, Nantou, Taiwan
[5] Natl Tsing Hua Univ, Inst NanoEngn & MicroSyst, Hsinchu 300, Taiwan
[6] Univ Chicago, Dept Radiol, Chicago, IL 60637 USA
[7] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan