Funding for this research was provided by:
National Research Foundation (2018R1D1A3B07043344)
Received: 2 November 2019
Accepted: 5 January 2020
First Online: 14 January 2020
Ethics approval and consent to participate
: The study protocol was approved by the local Institutional Review Board of the Asan Medical Center, and informed consent for the procedure was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interests.