1. Department of Orthopedic Surgery; Stanford University; Stanford California
2. Laboratoire de Biomécanique et Biomatériaux Ostéo-Articulaires-UMR CNRS 7052, Faculté de Médecine-Université Paris 7; Paris France
3. Department of Orthopedic Surgery; Hopital Cochin, APHP; Paris France
4. Department of Oral and Maxillofacial Surgery; University of Chile-Conicyt; Santiago Chile
5. Department of Bioengineering; Stanford University; Stanford California