1. Physical Medicine and Rehabilitation Division, Department of Orthopaedic Surgery Stanford University Redwood City California USA
2. Sports Medicine Division Department of Orthopedic Surgery, Mayo Clinic Minneapolis Minnesota USA
3. Department of Physical Medicine and Rehabilitation Spaulding Rehabilitation Hospital/Harvard Medical School Charlestown Massachusetts USA
4. Department of Orthopaedic Surgery Brigham and Women's Hospital/Harvard Medical School Boston Massachusetts USA