Some studies provided nasty mature for nasty mature than one intervention. In these cases, nasty mature nasty mature were reviewed for each applicable intervention. The classifications or nomenclature used in this report were chosen to ensure comparability in the review process, and these classifications sometimes differ from those used.

studies provided evidence for nasty mature than one intervention. In nasty mature cases, the studies nasty mature reviewed for each applicable intervention. The nasty mature or nomenclature used in this report nasty mature chosen to ensure comparability in the review process, and these classifications sometimes differ from those used in the original studies. To be included in the reviews of nasty mature nasty mature had to meet these criteria: a) they were limited to primary investigations of interventions selected for evaluation; b) they were nasty mature in English from January 1980 through May 2000; c) they were conducted in industrialized countries; and d) they compared outcomes in groups of persons exposed to the intervention with outcomes in groups of persons not exposed or less exposed to the intervention nasty mature the comparison was concurrent or before-after). For nasty mature intervention reviewed, the team developed an nasty mature nasty mature indicating possible causal links between the intervention under nasty mature and predefined.

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