1. Research Institute for Biomimetics and Soft Matter; Fujian Provincial Key Lab for Soft Functional Materials Research; Department of Physics; Xiamen University; Xiamen Fujian 361005 China
2. Mechanobiology Institute; National University of Singapore; Singapore 117411 Singapore
3. Department of Physics; National University of Singapore; Singapore 117542 Singapore
4. Centre for Bioimaging Sciences; National University of Singapore; Singapore 117546 Singapore
5. College of Physics; University of Chinese Academy of Sciences; Beijing 100190 China