1. Department of Orthopaedic SurgeryWashington University St. Louis Missouri USA
2. Institute for Biomedical ProblemsRussian Academy of Sciences Moscow Russia
3. Biology FacultyM.V. Lomonosov Moscow State University Moscow Russia
4. Department of Orthopedic SurgeryColumbia University, New York New York USA
5. Department of Biomedical EngineeringColumbia University, New York New York USA