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Source:
American Journal of Respiratory & Critical Care Medicine; Mar2009, Vol. 179 Issue 5, p383-389, 7p
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Source:
Statistics in Medicine; Dec2006, Vol. 25 Issue 24, p4164-4178, 15p
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European Journal of Clinical Nutrition; Feb2006, Vol. 60 Issue 2, p214-219, 6p
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American Journal of Respiratory & Critical Care Medicine; 2004, Vol. 170 Issue 10, p1080-1087, 8p
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Occupational & Environmental Medicine; Dec2003, Vol. 60 Issue 12, p977-982, 6p, 3 Graphs
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Source:
Journal of Epidemiology & Community Health; Oct2002, p773-779, 7p
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