Received: 23 March 2020
Accepted: 1 June 2020
First Online: 24 June 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Hokkaido University Hospital (study approval no. 017–0059). All animal experiments were performed according to a protocol approved by the Animal Care Committee of Hokkaido University.
: Not applicable.
: The authors declare that they have no competing interests.