1. Nuffield Department of Primary Care Health Sciences, Radcliffe Primary Care Building, University of Oxford, and National Institute for Health Research Oxford Biomedical Research Centre, Oxford University Hospitals, Oxford, United Kingdom (M.M., A.E.F., S.A.J., P.A.)
2. Nuffield Department of Primary Care Health Sciences, Radcliffe Primary Care Building, University of Oxford, Oxford, United Kingdom (G.H., L.G., M.K., A.T.).