1 Lifespan and Population Health, School of Medicine, University of Nottingham, Nottingham NG5 1PB, UK. Electronic address: [email protected].
2 School of Health Sciences, University of Nottingham, Nottingham NG5 1PB, UK.
3 Cicely Saunders Institute, King's College London, London, UK.
4 Nottingham University Business School, University of Nottingham, Nottingham NG5 1PB, UK.
5 Department of Infection and HIV Medicine, University Hospitals of Leicester NHS Trust, Leicester, UK; Department of Respiratory Sciences, University of Leicester, Leicester, UK.
6 Yale School of Public Health, Yale University, New Haven, CT, USA.
7 Peninsula Medical School, University of Plymouth, Plymouth, UK.