Backman, H., Hedman, L., Jansson, S., Lindberg, A., Lundbäck, B., & Rönmark, E. (2014). Prevalence trends in respiratory symptoms and asthma in relation to smoking - two cross-sectional studies ten years apart among adults in northern Sweden. World Allergy Organization.

Backman, Helena, Linnea Hedman, Sven-Arne Jansson, Anne Lindberg, Bo Lundbäck, and Eva Rönmark. Prevalence Trends in Respiratory Symptoms and Asthma in Relation to Smoking - Two Cross-sectional Studies Ten Years Apart Among Adults in Northern Sweden. World Allergy Organization, 2014.

Backman, Helena, et al. Prevalence Trends in Respiratory Symptoms and Asthma in Relation to Smoking - Two Cross-sectional Studies Ten Years Apart Among Adults in Northern Sweden. World Allergy Organization, 2014.