Affiliation: | a Norwegian Institute of Public Health Division of Environmental Medicine, Department of Air Pollution and Noise, Box 4404 Nydalen, N-0403 Oslo, Norway b Brekke and Strand akustikk as Hovfaret 17, N-0275 Oslo, Norway c Norwegian Institute of Public Health Department of Mental Health, Box 4404, Nydalen, N-0403 Oslo, Norway |