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Systematic review with meta-analysis.
Cochrane Controlled Trials Register, Current Controlled Trials, MEDLINE, EMBASE, PsycINFO, CINAHL, NHS Economic Evaluation Database, National Technical Information Service, Index to Scientific and Technical Proceedings (ISI Web of Science). Hand search of reference lists of recent reviews and trials, journals that had published trials identified by previous stage or that were known to publish trials on treatment of anxiety disorders. Experts in the field were asked to provide any trials that had not been identified by the previous stages (search date 2003).
Study selection and analysis:
Randomised controlled trials …
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