1 Department of Engineering and System Science, Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing-Hua University, Hsinchu, Taiwan, ROC.
2 Institute of NanoEngineering and MicroSystems, National Tsing-Hua University, Hsinchu, Taiwan, ROC.
3 Department of Engineering and System Science, Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing-Hua University, Hsinchu, Taiwan, ROC. fangang@ess.nthu.edu.tw.
4 Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan, ROC. fangang@ess.nthu.edu.tw.
5 Division of Colon and Rectal Surgery, Department of Surgery, Taipei Veterans General Hospital, Taipei, Taiwan, ROC.