1. The University of Nottingham; Department of Epidemiology and Public Health; City Hospital Campus Hucknall Road Nottingham UK NG5 1PB
2. Nottingham University Hospitals Trust; Department of Respiratory Medicine; City Campus Hucknall Road Nottingham Nottinghamshire UK NG5 1PB
3. The University of Nottingham; Division of Epidemiology and Public Health; Clinical Sciences Building Nottingham City Hospital NHS Trust Campus, Hucknall Road Nottingham UK NG5 1PB
4. The University of Nottingham; Faculty of Medicine and Health Sciences; Room A40D Clinical Sciences Building City Hospital Campus, Hucknall Road Nottingham Nottinghamshire UK NG5 1PB