1. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 Singapore
2. Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553, Singapore
3. Institute of Molecular and Cell Biology, Agency for Science Technology and Research, Singapore 138673, Singapore
4. Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599, Singapore
5. Singapore Eye Research Institute, Singapore 169856, Singapore
6. School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore