The Editor-in-Chief has retracted this article at the request of the authors following concerns regarding the use of data. The data were collected as part of a formally registered internal hospital quality improvement and clinical audit, and it was subsequently recognized that appropriate permissions and acknowledgments related to the audit and its contributors were not fully addressed prior to publication. As these data are not in the public domain, the contents have therefore been redacted and the article retracted. The authors agree with the decision to retract.
No competing interests declared.