1 Department of Diagnostic Radiology, Singapore General Hospital, Singapore.
2 Department of Diagnostic Radiology, Singapore General Hospital, Singapore; Duke-NUS Medical School, Singapore.
3 Duke-NUS Medical School, Singapore; Department of Diagnostic Imaging, KK Women's and Children's Hospital, Singapore.
4 Department of Infection Control and Epidemiology, Singapore General Hospital, Singapore.
5 Duke-NUS Medical School, Singapore; Department of Neurology, National Neuroscience Institute - Singapore General Hospital Campus, Singapore.
6 Department of Diagnostic Radiology, Singapore General Hospital, Singapore; Duke-NUS Medical School, Singapore. Electronic address: [email protected].