Funding for this research was provided by:
Japan Society for the Promotion of Science (26119525, H1601515, JP15J08281)
Article History
Received: 20 July 2016
Revised: 10 January 2017
Accepted: 26 June 2017
First Online: 10 July 2017
Compliance with Ethical Standards
:
: Koyo Nakamura has received a grant for fellows (constituting public funds) from the Japan Society for the Promotion of Science. Shihoko Arai has no grant. Hideaki Kawabata has received research grants (constituting public funds) from the Japan Society for the Promotion of Science. All authors declare no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and were approved by the local ethics committee of university that the authors are affiliated with. All procedures were carried out in accordance with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the studies. Before starting the experiment, each participant in all studies provided informed consent and signed a written consent form.