1. Department of Radiology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
2. Diagnostic Imaging, The Ottawa Hospital, Ottawa, Ontario, Canada
3. Diagnostic Radiology, Yale University School of Medicine, New Haven, Connecticut, USA
4. Division of Abdominal Imaging, Department of Radiology, Ohio State University Medical Center, Columbus, Ohio, USA
5. Department of Radiology, University of Texas Health Science Center at Houston, Houston, Texas, USA