1. Institute of Bioengineering and Nanotechnology; 31 Biopolis way, The Nanos; Singapore 138669 Singapore
2. IBM Almaden Research Center; 650 Harry Road San Jose CA 95120 USA
3. Department of Chemistry Center for Nature-inspired Technology in KINC; KAIST; Daejeon 305-701 Republic of Korea
4. National University Hospital; 1E Kent Ridge Road, NUHS Tower Block Level 10 Singapore 119228 Singapore
5. Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117576 Singapore