Analysis of information sources in references of the Wikipedia article "Ung thư phổi" in Vietnamese language version.
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(trợ giúp)There is sufficient evidence that involuntary smoking (exposure to secondhand or 'environmental' tobacco smoke) causes lung cancer in humans. ... Involuntary smoking (exposure to secondhand or 'environmental' tobacco smoke) is carcinogenic to humans (Group 1).
Secondhand smoke exposure causes disease and premature death in children and adults who do not smoke.Retrieved 2014-06-16
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