Funding for this research was provided by:
National Research Foundation of Korea (NRF-2016RIA2B4014121)
Article History
Received: 24 February 2019
Accepted: 2 April 2019
First Online: 10 April 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human specimens were in accordance with the ethical standards of the institutional research committee (IRB No: KHNMC 2016-10-018) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The institutional research committee had waived the process of obtaining consents from all individual participants included in this study, because this research was a study using residual samples.