1. School of Health and Related Research (ScHARR), The University of Sheffield, Regent Street, Sheffield S1 4DA, UK
2. School of Health and Related Research (ScHARR), The University of Sheffield, Sheffield, UK
3. Yorkshire and Humber School of Public Health, Leeds, UK
4. Faculty of Medicine and Health, University of Leeds, Leeds, UK
5. School of Health and Related Research, The University of Sheffield, Sheffield, UK
6. Anne McLaren Fellow, School of Health Sciences, Queen’s Medical Centre, University of Nottingham, Nottingham, UK