Footnotes

• Contributors MR drafted the initial manuscript and revised the final manuscript as submitted. BC critically reviewed and provided important intellectual content to the initial manuscript.

• Funding MR and BC are supported by a European Commission Horizon 2020 Grant, 667661, as part of the Promoting Mental Wellbeing in the Ageing Population: Determinants, Policies and Interventions in European Cities (MINDMAP) research project.

• Competing interests Other than as permitted in any relevant BMJ Author’s Self Archiving Policies, I confirm this work has not been accepted for publication elsewhere, is not being considered for publication elsewhere and does not duplicate material already published. I confirm all authors consent to publication of this work and authorise the granting of this licence.

• Patient consent for publication Not required.

• Provenance and peer review Commissioned; internally peer reviewed.