1. Department of Radiology, University of Illinois College of Medicine, Chicago, Illinois
2. Department of Radiology, Loyola University Stritch School of Medicine, Maywood, Illinois
3. College of Medicine, Chicago, Illinois
4. Department of Medical Imaging, The University of Arizona, College of Medicine, Banner, University Medical Center, Tucson, Arizona
5. Department of Orthopedic Surgery, University of Arizona, Tucson, Arizona