Text and Data Mining valid from 2019-08-15
Received: 28 May 2019
Accepted: 6 August 2019
First Online: 15 August 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. 2018-12-016-001).
: Not applicable
: The authors declare that they have no competing interests.