1. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, and University of Leoben, Jahnstrasse 12, 8700 Leoben, Austria
2. Ludwig Boltzmann Institute of Osteology, Hanusch Hospital, Vienna, Austria
3. Sincrotrone Trieste S.C.p.A, SS 14, km 163.5, in Area Science Parc, Basovizza, I–34012 Trieste, Italy
4. Department of Biological Sciences, University of Stirling, Stirling FK9 4LA, UK