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Leivseth L, B. B. M., Nilsen TI, Mai XM, Johnsen R, Langhammer A. (2013). GOLD classifications and mortality in chronic obstructive pulmonary disease: the HUNT Study, Norway. Thorax, 68(10).
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Mai, X. - M., Langhammer, A., Chen, Y., & Camargo, C. A. J. (2013). Cod liver oil intake and incidence of asthma in Norwegian adults--the HUNT study. Thorax, 68(1), 25–30.
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