Funding for this research was provided by:
Konkuk University Medical Center Research Grant 2017 (No. 201711)
Article History
Received: 17 February 2018
Revised: 5 May 2018
Accepted: 23 May 2018
First Online: 1 June 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 standards of the institutional and/or national research committee 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.