Alraek Terje, Soedal Liv Inger Fosli, Fagerheim Siri Urnes, Digranes Asbjørn, Baerheim Anders
Department of Public Health and Primary Health Care, Section for General Practice, University of Bergen, Ulriksdal 8C, N-5009 Bergen, Norway.
Am J Public Health. 2002 Oct;92(10):1609-11. doi: 10.2105/ajph.92.10.1609.