Funding for this research was provided by:
National Research Foundation of Korea (2015052849)
Article History
Received: 23 July 2018
Accepted: 20 October 2018
First Online: 29 October 2018
Compliance with ethical standards
:
: The authors have no conflict of interest.
: This study was approved by the institutional review boards of the three sample-recruiting hospitals and KAIST. Informed consent was obtained from all participants.