1. Flomenbom-BPS Ltd., 19 Louis Marshal Street Tel Aviv 62668, Israel
2. Institute for Materials Science, Technische Universität Dresden (TUD), 01062 Dresden, Germany
3. Max Bergmann Center of Biomaterials Dresden, Budapester Strasse 27, D-01069 Dresden, Germany
4. Department of Physics, University of Antwerp (CGB), Groenenborgerlaan 171, B-2020 Antwerpen, Belgium