Affiliation: | 1. Department of Physical Medicine and Rehabilitation, Mayo Clinic College of Medicine, Rochester, Minnesota USA;2. Department of Radiology, Mayo Clinic College of Medicine, Rochester, Minnesota USA;3. Department of Anatomy, Mayo Clinic College of Medicine, Rochester, Minnesota USA;4. Department of Physical Medicine and Rehabilitation, McMaster University, Hamilton, Ontario, Canada;5. Division of Rheumatology, Boston University School of Medicine, Boston, Massachusetts USA;6. Department of Radiology, University of Michigan, Ann Arbor, Michigan USA |