1. Canon Production Printing Netherlands B.V., P.O. Box 101, 5900 MA Venlo, Netherlands
2. Physics of Fluids Group, Max Planck Center Twente for Complex Fluid Dynamics, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands
3. Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, Netherlands
4. Max Planck Institute for Dynamics and Self-Organization, 37077, Göttingen, Germany
5. BIOS/Lab-on-a-Chip Group, Max Planck Center Twente for Complex Fluid Dynamics, MESA+ Institute for Nanotechnology, University of Twente, Enschede, Netherlands