Received: 12 March 2021
Accepted: 8 November 2021
First Online: 24 November 2021
: This was a systematic review which did not require specific ethical approval.
: All the co-authors have provided their consent for publication.
: GB is a co-investigator on a Resilience Hubs evaluation project: NIHR132269 - The Resilience Hubs: A multi-site, mixed-methods evaluation of an NHS Outreach, Screening and Support Navigation service model to address the mental health needs of key workers affected by the COVID-19 pandemic. No competing interests for any of the other co-authors.