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. 2015 Jun 24;5(6):e007624. doi: 10.1136/bmjopen-2015-007624

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Lung function outcomes and exposure to dense traffic in healthy individuals and in individuals with obstructive pulmonary disease adjusted for age, gender, BMI and education (asthma and COPD) (top) and in never, former and current smokers (bottom). BMI, body mass index; COPD, chronic obstructive pulmonary disease; FEV₁, forced expiratory volume in 1 s; FVC, forced vital capacity.