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The signatories of the statement were doctors and scientists representing members of the Forum of International Respiratory Societies a collaboration involving nine organisations from North and South America, Europe, Africa, Asia and Australia which promotes lung health worldwide
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Among the studies that do analyze doseresponse relationships, there is large variation in the units and dose categories used in reporting their findings (for example, the use of pack-years or cigarettes per day) 24,25 , which complicates the comparability and consolidation of evidence
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