Integrating programme theory into the development of a core outcome set for technology-assisted counselling interventions in dementia: study protocol of the ProCOS study.

The ProCOS (Development and evaluation of a technology-assissted counselling intervention for family caregivers of persons with dementia - Programme theory and preparation of a core outcome set) project is registered with the Core Outcome Measures in Effectiveness Trials initiative (https://www.comet-initiative.org/Studies/Details/2884).