Article History
Received: 10 November 2019
Accepted: 5 January 2020
First Online: 13 January 2020
Compliance with ethical standards
:
: All authors declare that they have no conflict of interest.
: Not Applicable.
: All procedures of the retrospective performed in research involving human participants complied with the standards of the institutional and national research committee and with the Helsinki Declaration.
: Not applicable.
: For this type of study, informal consent is not required.