Received: 1 January 2019
Accepted: 10 May 2019
First Online: 5 June 2019
Ethics approval and consent to participate
: The study was conducted with the approval of the institutional review board (IRB) of Tokyo Neurological Center and Matsui Hospital. All participants signed written consent to participate in the study. All rights of the patients were protected against any kind of disadvantage and individual matters.
: Not applicable.
: The authors declare that they have no competing interests.
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