Article History
Received: 28 August 2017
Revised: 29 December 2017
Accepted: 27 February 2018
First Online: 8 March 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standard of the institutional research committee (Amano’s institutional review board) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.Informed consent was obtained from all individual participants included in this study.