1. Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins University, 601 N Caroline St, JHOC 4240, Baltimore, MD 21287.
2. Department of General Internal Medicine, University of Maryland, Baltimore, MD.
3. Department of Orthopaedic Surgery, Johns Hopkins University, Baltimore, MD.
4. Department of General Internal Medicine, Johns Hopkins University, Baltimore, MD.
5. Department of Orthopaedic Surgery-Total Joints, Johns Hopkins University, Baltimore, MD.