1. Occupational Health Service, Guy’s and St Thomas NHS Foundation Trust , London SE1 7NJ , UK
2. School of Life Sciences and Medicine, King’s College London , London SE1 7UL , UK
3. UK Medical Research Council Versus Arthritis Centre for Musculoskeletal Health and Work, University of Southampton , Southampton SO16 6YD , UK
4. Epidemiology Group, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen , Aberdeen AB25 2ZD , UK
5. Psychology Department, Bath Spa University , Bath BA2 9BN , UK
6. Department of Psychology, Nottingham Trent University , Nottingham NG1 4FQ , UK
7. MRC/CSO Social and Public Health Sciences Unit, University of Glasgow , Glasgow G3 7HR , UK