1. University of Eastern Finland; Faculty of Health Sciences, Institute of Public Health and Clinical Nutrition; Yliopistonranta 1 Kuopio Finland FI-70210
2. Finnish Institute of Occupational Health; Cochrane Work Review Group; Neulaniementie 4 Kuopio Finland 70101
3. University of Eastern Finland; Institute of Public Health and Clinical Nutrition, Occupational Health Unit; PO Box 1627 Kuopio Finland 70211
4. Utrecht University; Institute for Risk Assessment Sciences (IRAS); Yalelaan 2 Utrecht Netherlands 3584CM