Text and Data Mining valid from 2019-11-30
Received: 4 August 2019
Accepted: 4 November 2019
First Online: 30 November 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Yeungnam University Medical Center, Daegu, Republic of Korea (IRB No. 2018-09-030-001).
: Not applicable
: The authors declare that they have no competing interests.