1. From the Department of Population Health Sciences, School of Population Health and Environmental Sciences (A.C., A. Bhalla, A.B., L.E.S., I.M., C.M., A.R., C.S., F.C.M., C.W., Y.W.), King’s College London, United Kingdom
2. Department of Ageing and Health, Guy’s and St Thomas’ NHS Foundation Trust, London, United Kingdom (A. Bhalla, A.R.)
3. Department of Neurology, University of Michigan, Ann Arbor (L.E.S.)
4. National Institute for Health Research Policy Research Unit in Health and Social Care Workforce, King’s College London, London, United Kingdom (J.M.)
5. National Institute for Health Research Biomedical Research Centre, Guy’s and St Thomas’ NHS Foundation Trust, London, United Kingdom (C.W., Y.W.)
6. National Institute for Health Research Collaboration for Leadership in Applied Health Research and Care South London, United Kingdom (C.W., Y.W.).