- Correspondence to Dr Izumi Kawachi, Department of Neurology, Brain Research Institute, Niigata University, 757 Asahimachi 1, Chuo-ku, Niigata 951-8585, Japan;
- Received 27 May 2016
- Revised 5 September 2016
- Accepted 7 September 2016
- Published online 13 January 2017.
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