Document is current

Article History

Received: 19 October 2019

Accepted: 24 February 2020

First Online: 5 March 2020

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 institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

: Informed consent was not required as part of the study, as the study was retrospective in nature. Information on individual patients on which this study was conducted has been anonymized where appropriate and no identifying details of the individual patients are described in this manuscript.