1. Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland
2. Department of Applied Physics, Aalto University School of Science and Technology, Finland
3. INSERM, UMR-S665, DSIMB 75015 Paris, France
4. Universite’ Paris Diderot - Paris 7, UFR Life Sciences, Paris, France
5. MEMPHYS - Center for Biomembrane Physics, University of Southern Denmark, Odense, Denmark