| http://www.w3.org/ns/prov#value | - Overall, we did not identify significant heterogeneity, by the 12 factors we show in figure 3, for these cancer sites (??2 test for heterogeneity aggregated across all characteristics: colon p=0??7, lung p=0??2, breast p=0??3, endometrium p=0??5, ovary p=0??2, remaining cancers p=0??2).Because there was no strong variation by cancer site in our study except in smokers, we did a meta-analysis of pu
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