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Tidsskrift for Den Norske Laegeforening : Tidsskrift for Praktisk Medicin, Ny Raekke|October 26, 1999
[What can twin research reveal about the causes of diseases?]P Magnus, J R Harris, W Nystad, et al.
Tidsskrift for Den Norske Laegeforening : Tidsskrift for Praktisk Medicin, Ny Raekke|February 20, 1997
[Occurrence of asthma among school children in Norway during the period 1985-94]W Nystad, P Magnus, V Søyseth
International Journal of Epidemiology|December 22, 1999
Day care attendance, recurrent respiratory tract infections and asthmaW Nystad, A Skrondal, P Magnus
Tidsskrift for Den Norske Laegeforening : Tidsskrift for Praktisk Medicin, Ny Raekke|March 13, 2001
[Day care centers, infections and asthma]W Nystad, A Skrondal, P Magnus
European Journal of Epidemiology|October 30, 2001
Physical activity affects the prevalence of reported wheezeW Nystad, P Nafstad, J R Harris
Scandinavian Journal of Primary Health Care|August 16, 2000
The wheezing schoolchild--an undiagnosed asthmatic. A follow-up of children with parentally reported episodes of wheeze without diagnosed asthmaO Hetlevik, O Pløen, W Nystad, et al.
Acta Paediatrica (Oslo, Norway : 1992)|September 2, 2003
Baby swimming increases the risk of recurrent respiratory tract infections and otitis mediaW Nystad, F Njå, P Magnus, et al.
Pediatric Allergy and Immunology : Official Publication of the European Society of Pediatric Allergy and Immunology|February 1, 1997
The prevalence of respiratory symptoms and asthma among school children in three different areas of NorwayW Nystad, P Magnus, O Røksund, et al.
The European Respiratory Journal|November 3, 2006
Genetic and environmental effects on exhaled nitric oxide and airway responsiveness in a population-based sample of twinsM B Lund, J Kongerud, W Nystad, et al.
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