Affiliation: | 1.Social Policy Research Unit, Department of Social Policy and Social Work, University of York, York, UK ;2.Personal Social Services Research Unit, School of Health Sciences, University of Manchester, Manchester, UK ;3.Manchester Centre for Health Economics, School of Health Sciences, University of Manchester, Manchester, UK ;4.Institute of Public Health, University of Cambridge, Cambridge, UK ;5.Centre for Biostatistics, School of Health Sciences, University of Manchester, Manchester, UK ; |