1. Department of Radiology, Mayo Clinic Hospital, 5777 E Mayo Blvd, Phoenix, AZ 85054.
2. Baptist Health System, Birmingham, AL.
3. Division of Cardiovascular Diseases, Mayo Clinic, Scottsdale, AZ.
4. Division of Cardiovascular Diseases, Mayo Clinic, Rochester, MN.
5. Division of Hematology, Mayo Clinic, Rochester, MN.