1. Departments of Orthopaedic Surgery, University of North Carolina Hospitals, Chapel Hill, NC.
2. Departments of Hematology/Oncology, University of North Carolina Hospitals, Chapel Hill, NC.
3. Departments of Pathology, University of North Carolina Hospitals, Chapel Hill, NC.
4. Departments of Diagnostic Radiology, University of North Carolina Hospitals, Chapel Hill, NC.
5. Wake Forest University Baptist Medical Center, Winston-Salem, NC, and the Department of Pathology and Laboratory Medicine, University of North Carolina Hospitals, Chapel Hill, NC.