(Q40667097)
Statements
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Is calculating pack-years retrospectively a valid method to estimate life-time tobacco smoking? A comparison between prospectively calculated pack-years and retrospectively calculated pack-years (English)
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Bernaards CM
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Twisk JW
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Snel J
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Van Mechelen W
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Kemper HC
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1 November 2001
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1653-1661
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Identifiers
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