1. BioSystems
and Micromechanics (BioSyM) IRG, Singapore-MIT Alliance for Research and Technology (SMART) Centre, 1 CREATE Way, Republic of Singapore 138602
2. Department
of Physics, National University of Singapore, 2 Science Drive 3, Republic of Singapore 117551
3. Department of Chemical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, United States