1. August Krogh Institute, University of Copenhagen, Universitetsparken 13, DK‐2100 Copenhagen Ø, Denmark,
2. Abteilung Membranbiophysik, Max‐Planck‐Institut für biophysikalische Chemie, D‐37077 Göttingen, Germany
3. Department of Mechanical Engineering, Fluid Mechanics Section, Technical University of Denmark, DK‐2800 Lyngby, Denmark