1. Department of Radiology, Mayo Clinic, Scottsdale, AZ.
2. Department of Radiology, Mallinckrodt Institute of Radiology, Washington University in St. Louis, 510 South Kingshighway Blvd, St. Louis, MO 63110.
3. Department of General Surgery, Mayo Clinic, Scottsdale, AZ.
4. Department of Oncology, Mayo Clinic, Scottsdale, AZ.