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August/September 2011 (vol. 08/2)
A meta-analysis of 15 randomised or quasi-randomised trials of cognitive behavioural interventions for anxiety disorders, found significant improvements in anxiety, depression and disorder-specific symptoms, although the effects diminished after six and 12 months. Effect sizes were small to moderate.
Occupational Health at Work August/September 2011 (vol. 08/2) pp43