- Correspondence to Dr Yasutaka Tajima, Department of Neurology, Brain Science Center, Sapporo City General Hospital, N11 W13 Chu-o-ku, Sapporo 060-8604, Japan;
- Received September 20, 2013
- Revised January 8, 2014
- Accepted January 29, 2014
- First published March 3, 2014.
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