Sandra H van Oostrom1,2,3
, Johannes R Anema1,2,3,4
, Berend Terluin1,5
, Anita Venema6
, Henrica CW de Vet1
and Willem van Mechelen1,2,3,4 
1EMGO Institute, VU University Medical Center, Amsterdam, The Netherlands
2Department of Public and Occupational Health, VU University Medical Center, Amsterdam, The Netherlands
3Body@Work, Research Center Physical Activity, Work and Health, TNO-VU, Amsterdam, The Netherlands
4Research Center for Insurance Medicine AMC-UWV-VU University Medical Center, Amsterdam, The Netherlands
5Department of General Practice, VU University Medical Center, Amsterdam, The Netherlands
6TNO Quality of Life, Hoofddorp, The Netherlands