- Correspondence to Dr Jin-Tai Yu, Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, No.5 Donghai Middle Road, Qingdao, Shandong Province 266071, China;
- Received January 23, 2014
- Revised March 18, 2014
- Accepted April 23, 2014
- First published May 16, 2014.
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