1. Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, United Kingdom (C.A., S.Z., C.K., J.J.L., P.A.)
2. School of Computer Science, University of Nottingham, Nottingham, United Kingdom (H.W.)
3. Department of Psychological and Behavioural Sciences, London School of Economics and Political Science, London, United Kingdom (E.S.).