- Correspondence to Dr Ying Yuan, Department of Radiology, Shanghai Ninth People's Hospital, Affiliated to Shanghai JiaoTong University School of Medicine, 639 Zhizaoju Road, Shanghai 200011, China;
- Received August 21, 2014
- Revised January 5, 2015
- Accepted January 25, 2015
- First published February 12, 2015.
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