1. Department of Radiology, University of Washington School of Medicine, Box 357115, 1959 NE Pacific St, Seattle, WA 98195.
2. Department of Radiology, Duke University Medical Center, Durham, NC.
3. Department of Radiology, University of Alabama at Birmingham, Birmingham, AL.
4. Department of Biostatistics and Bioinformatics, Duke University School of Medicine, Durham, NC.
5. Department of Radiological Sciences, Oncology and Pathology, La Sapienza University of Rome, ICOT Hospital, Latina, Italy.
6. Department of Diagnostic, Interventional and Pediatric Radiology, Hospital and University of Bern Inselspital, Bern, Switzerland.