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Duke Med Health News. 2009 May;15(5):12.
[No authors listed]
PMID: 19746517 [PubMed - indexed for MEDLINE]
Heart Advis. 2007 Sep; 10(9):8.
[Heart Advis. 2007]
Heart Advis. 2008 Aug; 11(8):8.
[Heart Advis. 2008]
Occup Environ Med. 1997 Nov; 54(11):781-4.
[Occup Environ Med. 1997]
Eur Respir J Suppl. 2003 May; 40:39s-46s.
[Eur Respir J Suppl. 2003]
JAMA. 2002 Aug 21; 288(7):830; author reply 830.
[JAMA. 2002]
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