Affiliation: | 1. Institute of Clinical Medicine, University of Helsinki, Helsinki, Finland 2. Unit of Systems Toxicology and Centre of Expertise for Health and Work Ability, Finnish Institute of Occupational Health, Helsinki, Finland 3. Department of Neurosurgery, Oulu University Hospital, Oulu, Finland 4. Institute of Diagnostics, Oulu University Hospital and University of Oulu, Oulu, Finland 5. Department of Orthopaedic Surgery, University of California at San Francisco, San Francisco, CA, USA 6. Centre of Expertise for Health and Work Ability, Occupational Health Services and Work Health, and Disability Prevention Centre, Finnish Institute of Occupational Health, Oulu, Finland 7. Centre for Life Course Epidemiology and Systems Medicine, Medical Research Center Oulu, Oulu University Hospital and University of Oulu, PL 5000, Oulu, 90014, Oulu, Finland
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