1. School of Health and Related Research, University of Sheffield, Regent Court, 30 Regent Street, Sheffield S1 4DA, UK
2. Institute of Work Psychology, University of Sheffield, Sheffield, UK
3. Medical School, Lancaster University and Institute of Infection and Global Health, University of Liverpool, Liverpool, UK
4. Epidemiology & Public Health, University College London, London, UK
5. 1st Department of Medicine, Semmelweis University Faculty of Medicine, Budapest, Hungary