Funding for this research was provided by:
Hallym University Research Fund (HURF-2016-49)
Article History
Received: 29 January 2018
Accepted: 19 February 2018
First Online: 26 February 2018
Compliance with ethical standards
:
: The authors have indicated no financial conflicts of interest.
: The study protocol was approved by our Institutional Review Board, and all subjects provided written informed consent.