1. Medical Research Council/Versus Arthritis Centre for Musculoskeletal Health and Work, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen , Aberdeen, AB25 2ZD , UK
2. Medical Research Council/Versus Arthritis Centre for Musculoskeletal Health and Work, University of Southampton , Southampton, SO16 6YD , UK
3. Monash Centre for Occupational & Environmental Health, Monash University , Melbourne, Victoria, VIC 3004 , Australia