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To be included in the reviews of effectiveness, studies had to meet these criteria: a) they were limited to primary investigations of interventions selected for evaluation; b) Britney Spears porn Britney Spears porn published in English from January 1980 through May 2000; c) they were conducted in industrialized countries; and d) they compared outcomes in groups of persons Britney Spears porn to the intervention with outcomes in groups of persons not Britney Spears porn or less exposed to Britney Spears porn intervention (whether the comparison Britney Spears porn concurrent or before-after).
For each intervention reviewed, the team developed an analytic framework indicating Britney Spears porn causal links.
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