1 Health Organisation, Policy, Economics (HOPE), Centre for Primary Care and Health Services Research, University of Manchester, Manchester, UK michael.anderson-3@manchester.ac.uk.
2 LSE Health, Department of Health Policy, London School of Economics and Political Science, London, UK.
3 Centre for Health Economics, University of York, York, UK.
4 Manchester University NHS Foundation Trust, Manchester, UK.
5 Health Organisation, Policy, Economics (HOPE), Centre for Primary Care and Health Services Research, University of Manchester, Manchester, UK.
6 Institute of Global Health Innovation, Imperial College London, London, UK.