1. Center for Advanced Orthopedic Studies, Department of Orthopedic Surgery,
2. Department of Neurosurgery, Brigham and Women’s Hospital, Boston, Massachusetts;
3. ARTORG Center for Biomedical Engineering Research, University of Bern;
4. University of Zurich & MRI Schulthess Clinic, Zurich;
5. Department of Orthopedic Surgery, Inselspital, Bern University Hospital, Bern; and
6. Clinique Bois-Cerf, Radiology Department, Lausanne, Switzerland
7. Department of Orthopedics,
8. Department of Medicine, and
9. Department of Radiology, Beth Israel Deaconess Medical Center, Boston;