Text and Data Mining valid from 2019-12-04
Received: 19 September 2019
Accepted: 19 November 2019
First Online: 4 December 2019
Compliance with ethical standards
: All authors declare that they have no conflict of interest.
: For this study, ethical approval is not required.
: Patients’ written informed consent was not needed, as this was a retrospective type of study.