1. University of Bern; Institute for Surgical Technology and Biomechanics; Stauffacherstr. 78 CH-3014 Bern Switzerland
2. EMPA, Swiss Federal Laboratories for Material Science and Technology; Laboratory for Mechanics of Materials and Nanostructures; Feuerwerkerstr. 39 CH-3602 Thun Switzerland
3. Vienna University of Technology; Institute of Lightweight Design and Structural Biomechanics; Gusshausstr. 27-29 A-1040 Vienna Austria
4. Medical University of Vienna; Department of Applied Anatomy; Währinger Str. 13 A-1090 Vienna Austria