- Correspondence to Dr Akash P Kansagra, Department of Radiology and Biomedical Imaging, University of California San Francisco, 505 Parnassus Avenue, M-391, San Francisco, CA 94143-0628, USA;
- Received November 5, 2012
- Revised November 5, 2012
- Accepted November 7, 2012
- First published December 6, 2012.
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