1. Division BIOSYST-MeBioS; Katholieke Universiteit Leuven; B-3001 Leuven Belgium
2. IPS/ANKA; Karlsruhe Institute of Technology; PO Box 3640 76021 Karlsruhe Germany
3. European Synchrotron Radiation Facility; 38043 Grenoble Cedex France
4. Research group of Materials Performance and Non-destructive Evaluation; Katholieke Universiteit Leuven; Kasteelpark Arenberg 44 BE-3001 Leuven Belgium