Received: 7 May 2021
Accepted: 5 November 2021
First Online: 3 January 2022
: This research was performed in accordance with the declaration of Helsinki. SAMBA is classified as an audit. This status has been confirmed by the North Wales Research Ethics Committee. Formal ethical review was not required. SAMBA is registered as a priority audit on the NHS England Quality Accounts list [CitationRef removed]. All patient-level data are collected during the delivery of routine care. As an audit individual patient consent is not required. Participating units were asked to register with their local audit office and Caldicott Guardian. Patient-level data uploaded to the online portal was non-identifiable.
: Not applicable.
: The authors declare that they have no competing interests.