Author(s) : Päivi Hirsso, Ulla Rajala, Liisa Hiltunen, Jari Jokelainen, Simo Näyhä, Sirkka Keinänenkiukaanniemi, University of Oulu, Department of Public Health Science and General Practice, Box 5000, FIN-90014 University of Oulu, Finland, Unit of General Practice, Oulu University Hospital, FIN-90029 OYS, Finland, Oulu Health Center, Box 8, FIN- 90015 City of Oulu, Finland, Finnish Institution of Occupational Health, Aapistie 1, 90220 Oulu. |
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