Article History
Received: 22 July 2020
Accepted: 9 January 2021
First Online: 21 January 2021
Ethics approval and consent to participate
: Ethical approval was not required since no identifying data were used. Permission was not required to access and use the hospital admission data.
: Health boards agreed to share their data. Chief executives have seen this publication ahead of publication.
: The authors have no competing interests to declare.