1. The Wallace H. Coulter Department of Biomedical Engineering; School of Chemistry and Biochemistry, Georgia Institute of Technology; Atlanta GA 30332 USA
2. Division of Bioengineering; Incheon National University; Incheon 406-772 Republic of Korea
3. Department of Chemical Engineering and Institute of Biomedical Engineering; National Tsing Hua University; Hsinchu 30013 Taiwan Republic of China