Funding for this research was provided by:
Japan Society for the Promotion of Science (15K07243, 18K06448, 17H03740)
Received: 16 January 2018
Accepted: 13 June 2018
First Online: 18 July 2018
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institution research committee and with the 1964 Helsinki Declaration and its later amendments for comparable ethical standards. Ethical approval was obtained from The Ethics Committee for Human Use of Nagasaki University. This study was approved by the Ethics Committee of Nagasaki University Graduate School of Biomedical Sciences (project registration number 14051404). Written consent forms were available in Japanese to ensure comprehensive understanding of the study objectives, and informed consent was provided by the participants.
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.