1 From the Centre for Health Economics, University of York, York, United Kingdom (RN, MS); the Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, United Kingdom (SAJ); the Behaviour and Health Research Unit, Institute of Public Health, University of Cambridge, Cambridge, United Kingdom (RP; TMM, e-mail: [email protected]); and the Medical Research Council Human Nutrition Research, Elsie Widdowson Laboratory, Cambridge, United Kingdom (EA-R).