Funding for this research was provided by:
National Research Foundation of Korea (2015M3A9D7067388)
Ministry of Science, ICT and Future Planning (IITP-2016-H8601-16-1009)
Article History
Received: 15 August 2017
Accepted: 27 February 2018
First Online: 12 March 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in this studyinvolving human participants were in accordance with the ethical standards of the Soonchunhyang University of Korea, and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.