Received: 27 December 2019
Accepted: 20 February 2020
First Online: 3 March 2020
Ethics approval and consent to participate
: Experiments were approved by the Committee on the Use and Care of Animals at Kumamoto University (Number H28–053) and Fujita Health University (Number AP16016) and complied with veterinary standards.
: Not applicable.
: The authors declare that they have no competing interests.