PT Journal AU Pershagen, G Norberg, S TI Health risk evaluation of nitrogen oxides. Epidemiologic studies. SO Scandinavian Journal of Work, Environment & Health PD VL PY 1993 BP 57 EP 69 IS 2 WP https://www.sjweh.fi/show_abstract.php?abstract_id=1514 SN 0355-3140 ER