| http://www.w3.org/ns/prov#value | - tinued until there is no longer significant heterogeneity.Sensitivity to the criterion for including estimates based on ST exposure is also tested by rerunning the meta-analyses with the preference list for ST exposure changed from ever use/unspecified use/current use/former use to current use/ever use/unspecified use/former use.Meta-regression analysisFor oropharyngeal cancer, fixed-effects regre
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