[1] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 1175762, Singapore
[2] Ctr Life Sci CeLS, NUS Grad Sch Integrat Sci & Engn, Singapore 117456, Singapore
[3] Singapore Inst Mfg Technol SIMTech, Singapore 638075, Singapore
[4] Shanghai Jiao Tong Univ, Dept Micro NanoElect, Shanghai 200240, Peoples R China
[5] Natl Univ Singapore, Dept Mech Engn, Singapore 117575, Singapore
[6] NUS Suzhou Res Inst, Suzhou 215123, Jiangsu, Peoples R China