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add12015-sup-0001-FigureS1.doc24K

Figure S1 Funnel plot of the log relative risk of absence and corresponding standard error between current smokers and non-smokers

add12015-sup-0002-FigureS2.doc24K

Figure S2 Funnel plot of the mean difference of absence and corresponding standard error between current smokers and non-smokers

add12015-sup-0003-FigureS3.doc24K

Figure S3 Funnel plot of the log relative risk of absence and corresponding standard error between ex-smokers and never smokers

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