1. Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058 Erlangen, Germany
2. Faculty of Technology and Metallurgy, University of Belgrade, Karnegijava 4, 11000 Belgrade, Serbia
3. Institute for Glass and Ceramic, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martenstrasse 5, 91058 Erlangen, Germany
4. Institute of Particle Technology, Department of Chemical and Biological Engineering, University of Erlangen-Nuremberg, Cauerstrasse 4, 91058 Erlangen, Germany
5. Laboratoire de Physique Corpusculaire, Clermont Université, Université Blaise Pascal, CNRS/IN2P3, BP 80026, 63171 Aubière Cedex, France