Received: 11 November 2017
Accepted: 17 May 2019
First Online: 30 May 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Seoul St. Mary’s Hospital, the Catholic University of Korea (approval No. KC17RESI0275). Written informed consent for participation in the study was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.