Article History
Received: 27 July 2020
Accepted: 10 December 2020
First Online: 19 February 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was approved by the Audit and Clinical Governance Committee of the Worcestershire Acute Hospitals NHS trust. The study was performed in accordance with the ethical standards as laid down in the 1964 declaration of Helsinki and its later amendments.
: Informed consent as this was a retrospective observational study, formal informed consent was not required.