STROBE statement—Checklist of items that should be included in reports of observational studies.
(DOCX)Click here for additional data file.(DOCX)Click here for additional data file.AAS, TA, and MDW acknowledge support from the NIHR Newcastle Biomedical Research Centre. AA acknowledges support from the Health Services Research Unit, which is core funded by the Chief Scientist Office of the Scottish Government Health and Social Care Directorate. The authors acknowledge support from the NIHR Ageing Clinical Research Network and the NHS Scotland Support for Science programme. The authors would also thank the efforts of all the research nurses and other site research staff who recruited participants to the trial, all the participants, and all the staff of the Tayside Clinical Trials Unit for their support of the trial.