1. Department of Musculoskeletal Imaging, ACR Institute for Radiologic Pathology, 1100 Wayne Ave, Ste 1020, Silver Spring, MD 20910
2. Department of Radiology, Uniformed Services University of the Health Sciences, Bethesda, MD
3. Musculoskeletal Section, Walter Reed National Military Medical Center, Bethesda, MD
4. Mayo Clinic College of Medicine, Rochester, MN
5. Department of Radiology, Mayo Clinic, Phoenix, AZ