- Correspondence to Dr X Yang, Department of Interventional Neuroradiology, Beijing Neurosurgical Institute and Beijing Tiantan Hospital, Capital Medical University, TiantanXili 6, Dongcheng District, Beijing 100050, China;
- Received December 10, 2014
- Revised January 8, 2015
- Accepted January 13, 2015
- First published February 4, 2015.
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