1. Department of Radiology and Radiologic Sciences, Vanderbilt University Medical Center, 1161 21st Ave. S, MCN CCC-1118, Nashville, TN 37232, USA
2. Department of Radiology, Northwestern Memorial Hospital, 676 N. Saint Clair Street, Suite 800, Chicago, IL 60611, USA
3. Department of Radiology, MSC08 4720, 1 University of New Mexico, Albuquerque, NM 87131, USA
4. Department of Pathology, University of New Mexico, New Mexico Office of the Medical Investigator, MSC08 4720, 1 University of New Mexico, Albuquerque, NM 87131, USA
5. Department of Orthopaedics and Rehabilitation, University of New Mexico, MSC 10 5600, 1 University of New Mexico, Albuquerque, NM 87131, USA
6. Department of Medical Imaging, University of Arizona, 1501 N. Campbell, Tucson, AZ 85724, USA