Funding for this research was provided by:
British Heart Foundation (FS/18/25/33454, FS/16/14/32023)
Medical Research Council (MR/N013166/1)
Received: 29 October 2020
Accepted: 9 March 2021
First Online: 6 April 2021
: The study was performed with approval of the local Research Ethics Committee and delegated Caldicott Guardian for the National Health Service (NHS) Lothian Health Board, in accordance with the Declaration of Helsinki. All data were collected from the patient record and national registries, deidentified and linked in a data repository (DataLoch, Edinburgh, United Kingdom) within a secure safe haven. To ensure that every eligible patient was included and avoid selection bias, individual patient consent was waived with approval from our research ethics committee and delegated Caldicott Guardian. Only summary data was extracted to minimise the risk of disclosure.
: Not applicable.
: All authors have no interests to declare.