Article History
Received: 24 May 2019
Accepted: 7 September 2019
First Online: 25 September 2019
Compliance with ethical standards
:
: No competing interest to declare
: The study complies with the declaration of Helsinki and ethical approval for this study was obtained from the Research and Innovation department of the Northern Care Alliance NHS Group (Ref: S19HRANA09). As this was a retrospective observational study with full patient anonymity, the Northern Care Alliance NHS Group Research and Innovation review board determined that the need for informed consent from surviving patients should be waived.