1. Key Laboratory of Clinical and Medical EngineeringSchool of Biomedical Engineering and InformaticsNanjing Medical University Nanjing 211166 P. R. China
2. Innovative Centre for Flexible Devices (iFLEX)School of Materials Science and EngineeringNanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore
3. Department of Materials Science and EngineeringStanford University Stanford CA 94305 USA
4. Department of Materials Science and Engineering and Department of ChemistryNorthwestern University Evanston IL 60208 USA
5. Fujian Provincial Key Laboratory of Innovative Drug Target Research and State Key Laboratory of Cellular Stress BiologySchool of Pharmaceutical SciencesXiamen University Xiamen Fujian 361102 P. R. China
6. Department of Biomedical EngineeringMechanobiology InstituteInstitute for Health Innovation and Technology (iHealthtech) National University of Singapore 9 Engineering Drive 1 Singapore 117576 Singapore
7. School of Chemical and Biomedical EngineeringNanyang Technological University 62 Nanyang Drive Singapore 637459 Singapore