1. Materials Science and Technology of Polymers and
2. Supramolecular Chemistry and Technology, Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
3. Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602
4. Division of Bioengineering, National University of Singapore, Singapore 117576