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Article History

Received: 19 November 2020

Accepted: 31 March 2021

First Online: 7 April 2021

Declarations

:

: Considering the nature of this study, which was a retrospective cohort study involving non-identifiable data from hospital databases, approval by the research ethics committees was not required; however, the study was conducted in accordance with the institutions’ policies and internal arrangements approved by local clinical governance units, and all authors declared compliance with the policies before being granted access to local hospital database. Considering the nature of this study, which was a retrospective cohort study involving non-identifiable data from hospital databases, there was no direct involvement of patients during the study; informed consent was not required.

: This study was a retrospective cohort study involving non-identifiable data from hospital databases, and there was no direct involvement of patients during the study; nevertheless, the study was conducted in compliance with the Helsinki ethical principles for medical research involving human subjects.

: The authors declare no competing interests.