Text and Data Mining valid from 2019-02-25
Received: 23 October 2018
Accepted: 25 January 2019
First Online: 25 February 2019
Compliance with ethical standards
: HS Nam, CW Choi, SJ Kim, DH Kang, HW Kim, SB Park, and DG Ryu have no conflicts of interest or financial ties to disclose.
: Written informed consent was obtained from all patients prior to the procedure. The study was approved by the ethics committee of the Institutional Review Board.