1. Harvard University, School of Engineering and Applied Sciences, Cambridge, Massachusetts 02138, United States
2. Wyss Institute for Biologically Inspired Engineering, Cambridge, Massachusetts 02138, United States
3. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
4. Center for Biomimetic Sensor Science, Nanyang Technological University, Singapore 637553, Singapore
5. School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore