1. Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
2. Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400044, P. R. China
3. NTU-Northwestern Institute for Nanomedicine, Interdisciplinary Graduate School, Nanyang Technological University, 50 Nanyang Drive, 637553 Singapore