Funding for this research was provided by:
Korea government (2015S1A5A2A01012405)
Article History
Received: 2 September 2016
Accepted: 10 November 2016
First Online: 19 November 2016
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 1964 Helsinki Declaration and its later amendments. No studies with animals were performed.
: The study was approved by the Bioethics Committee (Institutional Review Board) of Korea University (KU-IRB-14-44-A-1) and complied with the standards set by the Declaration of Helsinki.
: Informed consent was obtained from all individual participants included in the study.