1. Department of Radiology, St. Vincent's Medical Center, Bridgeport, CT.
2. Department of Radiology, University of Texas Health, 7703 Floyd Curl Dr, Mail Code 7800, San Antonio, TX 78229.
3. Department of Radiology, University Hospitals Cleveland Medical Center, Cleveland, OH.
4. Department of Radiology, Case Western Reserve University, Cleveland, OH.
5. Department of Radiology, Ohio State University Wexner Medical Center, Columbus, OH.