1. Department of Diagnostic Radiology, Singapore General Hospital, Singapore, Singapore
2. Department of Radiology, Emory University School of Medicine, Atlanta, GA, USA
3. Department of Radiology, University of Washington, Seattle, WA, USA
4. Department of Vascular and Interventional Radiology, Division of Radiological Sciences, Singapore General Hospital, Singapore, Singapore
5. Department of Radiology, University of Vermont College of Medicine, Burlington, VT, USA