Funding for this research was provided by:
Japan Society for the Promotion of Science (18K07086)
Ministry of Health, Labour and Welfare (Japan Initiative for Global Research Network on Infectious Diseases (J-GRID) (JP18m0108002))
Kobayashi International Scholarship Foundation (201834)
Received: 11 March 2019
Accepted: 28 May 2019
First Online: 5 July 2019
Ethics approval and consent to participate
: The animal experiment in this study was approved by the Committee on the Animal Experiments of Okayama University (OKU-2016150), and all animal experiments were performed in the Animal Research Center at Tsushima Campus in accordance with the guidelines for laboratory animals of Okayama University.
: Not applicable
: The authors declare that they have no competing interests.