Funding for this research was provided by:
Japan Society for the Promotion of Science (26350631)
Received: 23 July 2019
Accepted: 27 November 2019
First Online: 10 December 2019
Ethics approval and consent to participate
: The present study was performed according to the ethical standards Declaration of Helsinki and approved by the ethics committees of Kitasato University (approval number: 2016-014) and Tokyo University of Technology (approval number: E18HS-018). Informed consent was obtained from all individual participants included in the present study.
: Not applicable.
: The authors declare that they have no competing interests.