[1] Soochow Univ, Sch Mech & Elect Engn, Jiangsu Prov Key Lab Adv Robot, Suzhou 215123, Peoples R China
[2] Natl Univ Singapore, Dept Elect & Comp Engn, 4 Engn Dr 3, Singapore 117576, Singapore
[3] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA
[4] Univ Calif Berkeley, Berkeley Sensor & Actuator Ctr, Berkeley, CA 94720 USA
[5] Natl Univ Singapore, Hybrid Integrated Flexible Stretchable Elect Syst, E6 05-4,5 Engn Dr 1, Singapore 117608, Singapore
[6] NUS Suzhou Res Inst NUSRI, Suzhou Ind Pk, Suzhou 215123, Peoples R China
[7] Natl Univ Singapore, NUS Grad Sch Integrat Sci & Engn, Singapore 117456, Singapore
[8] Natl Univ Singapore, Ctr Intelligent Sensors & MEMS, E6 05-11F,5 Engn Dr 1, Singapore 117608, Singapore
[9] Univ Calif Berkeley, Dept Bioengn, Berkeley, CA 94720 USA