1. a Department of Environmental Health , Harvard University , Boston , MA , USA
2. b Department of Public and Occupational Health and the EMGO Institute for Health and Care Research , VU University Medical Center , Amsterdam , the Netherlands
3. c Body@Work Research Center on Physical Activity, Work and Health , TNO-VU/VUmc , Amsterdam , the Netherlands
4. d Department of Environmental and Occupational Health Sciences , University of Washington , Seattle , WA , USA
5. e Research Institute MOVE, Faculty of Human Movement Sciences , VU University Amsterdam , Amsterdam , the Netherlands
6. f Netherlands Organisation for Applied Scientific Research , TNO , Hoofddorp , the Netherlands
7. g Department of Orthopaedic Surgery, Brigham and Women's Hospital , Harvard Medical School , Boston , MA , USA