1. Max Planck Institute for Polymer Research, Mainz, Germany.
2. Physics of Fluids Group, Max Planck Center for Complex Fluid Dynamics, Mesa+ Institute, and J.M. Burgers Center for Fluid Dynamics, University of Twente, Enschede, Netherlands.
3. Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany.
4. Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA.