- Correspondence to Dr X Yang, Department of Interventional Neuroradiology, Beijing Neurosurgical Institute and Beijing Tiantan Hospital, Capital Medical University, Tiantan Xili, 6#, Beijing 100050, China;
- Received August 7, 2012
- Revised September 21, 2012
- Accepted September 24, 2012
- First published October 19, 2012.
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