- Correspondence to Professor Simon Chun Ho Yu, Department of Imaging and Interventional Radiology, Prince of Wales Hospital, The Chinese University of Hong Kong, 30–32 Ngan Shing Street, Shatin, The New Territories, Hong Kong 852, China;
- Received November 27, 2012
- Revised February 13, 2013
- Accepted February 25, 2013
- First published March 19, 2013.
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