Document is current

Article History

Received: 2 October 2019

Accepted: 12 March 2020

First Online: 20 March 2020

Ethics approval and consent to participate

: This retrospective study was carried out following the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or ethical standards. The requirement to obtain informed consent was waived as this was a retrospective study. All patient data were treated following the local privacy regulations.

: Not applicable.

: The authors declare that they have no competing interests.