1. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
2. Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
3. Department of Chemical Engineering, University of Washington, Seattle, Washington 98195, USA
4. Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
5. Department of Mathematics and Computer Science & Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, MetaForum, 5600 MB Eindhoven, The Netherlands