[1] Cranfield Univ, Dept Mat, Microsyst & Nanotechnol Grp, Cranfield MK43 0AL, Beds, England
[2] Univ Bath, Dept Mech Engn, Mat Res Ctr, Bath BA2 7AY, Avon, England
[3] Linkoping Univ, Dept Sci & Technol, SE-60174 Norrkoping, Sweden
[4] Linkoping Univ, Dept Phys Measurement Technol Biol & Chem, SE-58183 Linkoping, Sweden
[5] Gothenburg Univ, Dept Phys, SE-41296 Gothenburg, Sweden
[6] Univ Kiel, Fac Engn, Inst Sci Mat, D-24143 Kiel, Germany
[7] Imego AB, SE-41133 Gothenburg, Sweden
[8] Aalto Univ, Mat Sci Lab, Helsinki 02015, Finland
[9] Forschungszentrum Karlsruhe, IMT, D-76021 Karlsruhe, Germany
[10] Vienna Univ Technol, Inst Sensor & Actuator Syst, A-1040 Vienna, Austria
[11] Royal Inst Technol KTH, Sch Elect Engn, Microsyst Technol Lab MST, S-10044 Stockholm, Sweden
[12] Micromuscle AB, SE-58330 Linkoping, Sweden
[13] IMT Bucharest, Natl Inst Res & Dev Microtechnol, Microstruct Bio Med Applicat Res Lab, Bucharest 077190, Romania
[14] Fundac Tekniker, Micro & Nanotechnol Dept, Eibar 20600, Guipuzcoa, Spain
[15] ETH, Dept Mech Engn, CH-8092 Zurich, Switzerland
[16] Fraunhofer Inst Appl Polymer Res, D-14476 Postdam Golm, Germany