Affiliation: | 1. Faculty of Health Sciences, Group of Ergonomics , Institute of Biomedicine, University of Eastern Finland , Kuopio , Finland marja.randelin@uef.fi;3. Faculty of Health Sciences, Department of Nursing Science , University of Eastern Finland , P.O. Box 1627, Kuopio FI-70211 , Finland;4. Finnish Institute of Occupational Health , P.O. Box 93, Kuopio FI-70701 , Finland;5. Faculty of Health Sciences, Group of Ergonomics , Institute of Biomedicine, University of Eastern Finland , Kuopio , Finland |