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Langhammer, A., Krokstad, S., Romundstad, P., Heggland, J., & Holmen, J. (2012). The HUNT study: participation is associated with survival and depends on socioeconomic status, diseases and symptoms. BMC Med Res Methodol, 12, 143.
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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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