1. School
of Materials Science and Engineering, Nanyang Technological University, N4.1, 50 Nanyang Avenue, Singapore 639798, Singapore
2. School
of Biological Sciences, Nanyang Technological University, 60 Nanyang
Drive, Singapore 637551, Singapore
3. Department
of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585, Singapore