Received: 10 February 2021
Accepted: 18 May 2021
First Online: 26 June 2021
: The research database for the NIHR HIC viral hepatitis theme was approved by South Central - Oxford C Research Ethics Committee (REF Number: 15/SC/0523). All methods in this study were carried out in according to relevant guidelines and regulations. The requirement for written informed consent was waived by South Central - Oxford C Research Ethics Committee, because data has been de-identified before its use and the study is retrospective.
: Not applicable.
: The authors declare that they have no competing interests.