Text and Data Mining valid from 2020-04-16
Received: 14 November 2019
Accepted: 13 April 2020
First Online: 16 April 2020
Ethics approval and consent to participate
: This retrospective study was approved by the institutional review board of our hospital (B-1906/547–104), and informed consent was waived owing to the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.