Affiliation: | 1.Institut universitaire romand de Santé au Travail, Institut für Arbeit und Gesundheit,Institute for Work and Health (IST),Lausanne,Switzerland;2.Occupational and Environmental Medicine, Department of Public Health and Primary Health Care,University of Bergen,Bergen,Norway;3.Department of Environmental Health,University of Cincinnati College of Medicine,Cincinnati,USA;4.Department of Occupational Medicine,Haukeland University Hospital,Bergen,Norway |