| http://www.w3.org/ns/prov#value | - We did a sensitivity analysis including the three studies in which the diagnostic criterion was a history of having received a diagnosis of COPD, and showed that biomass smoke is still a risk factor for COPD. In addition, all the subgroup analyses showed that biomass smoke is a risk factor for COPD, except for the subgroup analysis that included only men, which showed no association between biomas
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