Text and Data Mining valid from 2019-06-01
Received: 19 December 2018
Accepted: 23 May 2019
First Online: 1 June 2019
Ethics approval and consent to participate
: This study was retrospective in nature, and final approval of informed consent exemption by the institutional review board was obtained (KMC IRB 1440–09).
: Not applicable.
: The authors declare that they have no competing interests.