Funding for this research was provided by:
Gil Medical Center (JJ2012-09)
Received: 19 June 2019
Accepted: 28 November 2019
First Online: 1 January 2020
Ethics approval and consent to participate
: This study was approved by Gachon University Gil Medical Center Institutional Review Board (IRB No.: GCIRB2013–06).
: Not applicable.
: The authors declare that they have no competing interests.