1. Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore
2. Jesse Brown Veterans Administration Medical Center, Chicago, IL 6061, USA
3. Department of Microbiology and Immunology, University of Illinois-Chicago, Chicago, IL 60612, USA
4. Department of Biochemistry, National University of Singapore, Singapore 117596, Singapore
5. Department of Physics, National University of Singapore, Singapore 117542, Singapore
6. Centre for Bioimaging Sciences, National University of Singapore, Singapore 117546, Singapore