Text and Data Mining valid from 2019-08-08
Received: 13 March 2019
Accepted: 20 July 2019
First Online: 8 August 2019
Compliance with ethical standards
: The study was approved by the ethics committee of the Keimyung University Dongsan Medical Center. The need for written informed consent was waived due to the study’s retrospective design.
: The authors declare that they have no conflict of interest.