Funding for this research was provided by:
Ministry of Education, Culture, Sports, Science and Technology (18K07060)
Received: 19 November 2018
Accepted: 16 May 2019
First Online: 29 May 2019
Ethics approval and consent to participate
: This study was approved by the ethics committee of Hokkaido University. This article adheres to the ARRIVE guidelines for the reporting of animal experiments.
: Not applicable.
: The authors declare that they have no competing interests.
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