- Correspondence to Professor Yanqing Feng, Department of Neurology, The First Affiliated Hospital of SUN Yat-sen University, 58, Zhongshan 2 Road, Guangzhou 510080, PR China;
- Received November 13, 2009
- Revised January 16, 2010
- Accepted January 20, 2010
- First published June 27, 2010.
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