1. University of Arizona Arthritis Center, University of Arizona College of Medicine, Tucson, AZ 85724, USA
2. Departments of Medical Imaging and Orthopaedic Surgery, University of Arizona, Tucson, AZ 85719, USA
3. Department of Radiology, University of New Mexico Health Sciences, Albuquerque, NM 87131, USA
4. Tualatin Imaging P.C., Tualatin, OR 97062, USA
5. Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA
6. Department of Epidemiology and Biostatistics, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ 85724, USA
7. VA Boston Healthcare System, West Roxbury, Boston, MA 02132, USA
8. Department of Radiology, Boston University School of Medicine, Boston, MA 02118, USA