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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.
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