Text and Data Mining valid from 2019-07-01
Received: 24 March 2019
Accepted: 6 June 2019
First Online: 1 July 2019
Change Date: 26 July 2019
Change Type: Correction
Change Details: .
Ethics approval and consent to participate
: This retrospective study was approved by the Institutional Review Board of Kyung Hee University Medical Center (IRB No: K-2013-11018794).
: Not applicable.
: The authors declare that they have no competing interests.