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Figure 1 | BMC Medicine

Figure 1

From: Systematic review of the relation between smokeless tobacco and cancer in Europe and North America

Figure 1

Flow chart for search strategy for review of literature on smokeless tobacco and cancer. The flow chart shows the number of publications identified by the MEDLINE search, and the number excluded by reason. The number of additional publications identified from reviews and secondary references is also indicated, as is the total number of publications considered in the review and meta-analysis, subdivided by study type.

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