1. Department
of Physics, Xiamen University, Xiamen, Fujian 361005, China
2. Mechanobiology
Institute, National University of Singapore, Singapore 117411
3. Department
of Biological Sciences, Columbia University, New York, New York 10027, United States
4. Department
of Physics, National University of Singapore, Singapore 117542
5. Centre
for Bioimaging Sciences, National University of Singapore, Singapore 117546