Funding for this research was provided by:
Text and Data Mining valid from 2019-06-21
Received: 24 February 2017
Accepted: 4 June 2019
First Online: 21 June 2019
: All animals were handled in accordance with the Guide for the Care and Use of Laboratory Animals, Graduate School of Veterinary Medicine, Hokkaido University (approved by the Association for Assessment and Accreditation of Laboratory Animal Care International; experimental protocol approval no. 13–0032 and 16–0124).
: Not applicable.
: The authors declare that they have no competing interests.