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Ethical approval was granted from Newcastle & North Tyneside Research Ethics Committee (24.03.2017, reference number: 16\/NE\/0420) and Scotland Research Ethics Committee A (05.04.2017) reference number: 17\/SS\/0001) accordingly. Ethical approval permitted witnessed verbal consent. Ethical approval for the Norwegian cohort of stable dementia patients has been granted via the Norwegian Registry of Persons with Cognitive Symptoms [NorCog] (Reference: S-08143a and 2017\/371). The trial is registered with ISRCTN 43803769. 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