Funding for this research was provided by:
Hanyang University (HY-2018)
Received: 8 January 2019
Accepted: 24 May 2019
First Online: 31 May 2019
Ethics approval and consent to participate
: The Institutional Review Board (IRB) of Seoul St. Mary’s Hospital (KC18REDI0751) and Hanyang University (2018–08–017-001) approved this study. The study was a secondary data analysis and did not involve contact with individual patients so consent to participate was not applicable. Access to case data was approved by the Hanynag University and Seoul St. Mary’s hospital.
: Not applicable.
: The authors declare that they have no competing interest.