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Jennifer Wenborn, Gail Mountain, Esme Moniz-Cook, Fiona Poland, Michael King, Rumana Omar, Aidan O’Keeffe, Stephen Morris, Elena Pizzo, Susan Michie, Myrra Vernooij-Dassen, Maud Graff, Jane Hill, David Challis, Ian Russell, Catherine Sackley, Sinéad Hynes, Nadia Crellin, Jacqueline Mundy, Jane Burgess, Tom Swinson, Laura Di Bona, Becky Field, Cathryn Hart, Jacki Stansfeld, Holly Walton, Sally Rooks, Ritchard Ledgerd & Martin Orrell.

Jennifer Wenborn ^1,2,*, Gail Mountain ^3,4, Esme Moniz-Cook ⁵, Fiona Poland ⁶, Michael King ⁷, Rumana Omar ^7,8, Aidan O’Keeffe ^7,8, Stephen Morris ⁹, Elena Pizzo ⁹, Susan Michie ¹⁰, Myrra Vernooij-Dassen ¹¹, Maud Graff ¹¹, Jane Hill ², David Challis ¹², Ian Russell ¹³, Catherine Sackley ¹⁴, Sinéad Hynes ¹⁵, Nadia Crellin ², Jacqueline Mundy ^2,16, Jane Burgess ^1,2, Tom Swinson ², Laura Di Bona ⁴, Becky Field ⁴, Cathryn Hart ¹⁷, Jacki Stansfeld ^1,2, Holly Walton ¹⁰, Sally Rooks ², Ritchard Ledgerd ², Martin Orrell ¹⁸

¹ Division of Psychiatry, University College of London, London, UK
² Research and Development Department, North East London NHS Foundation Trust, London, UK
³ Centre for Applied Dementia Studies, Faculty of Health Studies, University of Bradford, Bradford, UK
⁴ School of Health and Related Research (ScHARR), University of Sheffield, Sheffield, UK
⁵ Faculty of Health Sciences, University of Hull, Hull, UK
⁶ School of Health Sciences, University of East Anglia, Norwich, UK
⁷ Priment Clinical Trials Unit, University College London, London, UK
⁸ Department of Statistical Science, University College London, London, UK
⁹ Department of Applied Health Research, University College London, London, UK
¹⁰ University College London Centre for Behaviour Change, Department of Clinical, Educational and Health Psychology, University College London, London, UK
¹¹ Radboud University Medical Centre (Radboudumc), Nijmegen, the Netherlands
¹² Personal Social Services Research Unit, Faculty of Medical and Human Sciences, University of Manchester, Manchester, UK
¹³ Medical School, Swansea University, Swansea, UK
¹⁴ Department of Public Health Sciences, King’s College London, London, UK
¹⁵ School of Health Sciences, National University of Ireland Galway, Galway, Ireland
¹⁶ School of Health Sciences, City, University of London, London, UK
¹⁷ Humber Teaching NHS Foundation Trust, Hull, UK
¹⁸ Institute of Mental Health, University of Nottingham, Nottingham, UK
^* Corresponding author Email: j.wenborn@ucl.ac.uk

Disclosure of interests of authors: Michael King was a member of the following committees: National Institute for Health and Care Research (NIHR) Health Technology Assessment (HTA) Programme Trials Board (2007–10) and NIHR Rapid Trials and Add-on Studies Board (May–November 2012). Susan Michie reports grants from the Department of Health and Social Care, Cancer Research UK (London, UK), The Wellcome Trust (London, UK), NIHR School for Public Health Research, Public Health England, Economic and Social Research Council (ESRC), NIHR, NIHR Programme Grants for Applied Research, Bupa, Horizon2020 – European Commission, the Medical Research Council, ESRC/NIHR Dementia 2012, Engineering and Physical Sciences Research Council (EPSRC), National Institute for Health and Care Excellence and ESRC, Canadian Institute of Health Research and the British Psychological Society, outside the submitted work. Stephen Morris reports membership of the following committees: the NIHR Health and Social Care Delivery Research (HSDR) Funding Board (2014–19), NIHR HSDR Commissioning Board (2014–16), NIHR HSDR Evidence Synthesis Sub-board (2016), NIHR HTA Clinical Evaluation and Trials Board (associate member) (2007–10), NIHR HTA Commissioning Board (2009–13) and NIHR Public Health Research Funding Board (2011–17). Gail Mountain was a member of the NIHR HTA Commissioning Board (2011–16). Rumana Omar is a member of the NIHR HTA General Board (2016 to present). Martin Orrell reports the NIHR Programme Grant for Applied Research grant number RP-PG-0612–20004 (AQUEDUCT) outside the submitted work. Catherine Sackley has been a member of the following committees: the NIHR HSDR Researcher-Led Board (2012–16), NIHR Rapid Trials and Add-on Studies Board (May–November 2012) and NIHR HSDR Commissioning Board (2009–12). Holly Walton’s PhD research was funded by the ESRC Doctoral Training Centre (grant reference ES/J500185/1), as part of the Promoting Independence in Dementia programme (grant references 2014–2015 ES/L001802/1 and 2015–2019: ES/L001802/2).