Text and Data Mining valid from 2019-04-03
Received: 24 January 2019
Accepted: 19 March 2019
First Online: 3 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in this study were in accordance with the ethical standards of the institution.
: Informed consent was obtained from all individuals included in the study, whenever possible, taking into account the retrospective nature of the study.