1. Pillar of Engineering Product DevelopmentSingapore University of Technology and Design Singapore 487372 Singapore
2. Department of Biological EngineeringMassachusetts Institute of Technology Cambridge MA 02139 USA
3. Department of Electrical Engineering and Computer ScienceMassachusetts Institute of Technology Cambridge MA 02139 USA
4. Department of Biomedical EngineeringThe University of Melbourne Melbourne VIC 3010 Australia