Received: 1 September 2019
Accepted: 5 December 2019
First Online: 21 December 2019
Ethics approval and consent to participate
: Experiments using rats were performed in accordance with the Guidelines for the Care and Use of Laboratory Animals in Hokkaido University (Permission No. 15-0034). Experiments using human materials were permitted by the Ethics Committee of the Faculty of Health Sciences, Hokkaido University (Permission No. 18-34).
: Not applicable.
: The authors declare that they have no competing interests.