1. Department of Radiology, University of Colorado Hospital, Denver, CO.
2. Present address: Advanced Radiology Services, Grand Rapids, MI.
3. Department of Radiology, The Children's Hospital of Philadelphia, 34th St and Civic Center Blvd, Philadelphia, PA 19104.
4. Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA.
5. Department of Orthopaedic Surgery, Rhode Island Hospital–Brown University, Providence, RI.
6. Present address: Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, MA.
7. Department of Radiology, Mayo Clinic, Jacksonville, FL.