Funding for this research was provided by:
Seoul National University Bundang Hospital (14-2017-001)
National Research Foundation of Korea (2015M3C1B2052817)
Received: 6 March 2019
Accepted: 11 June 2019
First Online: 12 July 2019
Ethics approval and consent to participate
: This study protocol was reviewed and approved by the Institutional Review Board of the University Hospital in November 2018(B-1810/497-002) and written informed consent was obtained from all participants.
: Not applicable
: The authors declare that they have no competing interests.