- Correspondence to Professor Z Miao, Department of Interventional Neuroradiology, Beijing Tiantan Hospital, Capital Medical University, 6 Tiantan Xili, Dongcheng District, Beijing 100050, China;
- Received January 15, 2014
- Revised March 28, 2014
- Accepted March 31, 2014
- First published April 23, 2014.
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