Text and Data Mining valid from 2019-12-01
Received: 23 September 2019
Accepted: 12 November 2019
First Online: 23 December 2019
Ethics approval and consent to participate
: This study was approved by the institutional review board (IRB) of the Ajou University Hospital (IRB No: AJIRB-MED-MDB-18-295). Subjects read and signed their informed consents.
: Not applicable.
: The authors declare that they have no competing interests.