Table 1 Inclusion and exclusion criteria for literature selection

Specific to underrepresented populations following the definition of ComPHAD, related to super-diverse groups at risk of or who have developed dementia/ brain health issues in the UK.

Academic literature and reports that do not include a UK population.

Must include acquired cognitive impairment, such as dementia and mental health issues.

Any brain health issue that is congenital.

Publicly available online or in other formats, published by government and non-government organisations, from most recent year, but not earlier than September 2013.

Material type pertaining to frameworks, guidance, guides or toolkits.

Involvement of two or more stakeholder groups.

Non-healthcare sectors (e.g., grassroots, advocacy groups).

Clear statement of at least one method used to gain insight into the targeted population to inform policy, research and/ or practice. Thus, not only being co-creators but also providing an assessment of their participation experiences was needed to be reported.

No clear statement of at least one method used to gain insight into the targeted population to inform policy, research and/ or practice. Thus, not only being co-creators but also providing an assessment of their participation experiences was needed to be reported.