Text and Data Mining valid from 2020-04-25
Received: 3 January 2020
Accepted: 14 April 2020
First Online: 25 April 2020
Ethics approval and consent to participate
: We respected all patients’ rights to privacy and protected their identity. The study protocol was approved by the Institutional Review Board of Gyeongsang National University Hospital (IRB no. 2013–03-018), who waived the need for informed consent. All individual information was deidentified.
: Not applicable.
: The authors declare that they have no competing interests.