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    • A case-control study of airways obstruction among construction workers. 

      Chen, A; Dement, John M; Haas, S; Quinn, P; Ringen, K; Welch, L (Am J Ind Med, 2015-10)
      BACKGROUND: While smoking is the major cause of chronic obstructive pulmonary disease (COPD), occupational exposures to vapors, gases, dusts, and fumes (VGDF) increase COPD risk. This case-control study estimated the risk ...