[1] Univ Edinburgh, Ctr Clin Brain Sci, Edinburgh, Midlothian, Scotland
[2] Bashkir State Med Univ, Dept Neurol Neurosurg & Med Genet, Ufa, Russia
[3] Univ Glasgow, Nursing & Hlth Care Sch, Glasgow, Lanark, Scotland
[4] Glasgow Caledonian Univ, Nursing Midwifery & Allied Hlth Profess Res Unit, Glasgow G4 0BA, Lanark, Scotland
[5] Western Gen Hosp, Dept Med Elderly, Edinburgh EH4 2XU, Midlothian, Scotland
[6] Univ Oxford, Dept Psychiat, Oxford, England