Funding for this research was provided by:
Health Connect Research Fund (No. 16-2013-87)
Received: 4 April 2020
Accepted: 8 June 2020
First Online: 13 June 2020
Ethics approval and consent to participate
: This study was approved by the institutional review board of the Seoul National University Boramae Medical Center (No.16-2013-87).
: The consent to publish was obtained from all participants in this study.
: The authors declare that they have no competing interests.