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"Conclusion: We conclude that, because of the paucity and of the poor quality of the data, the evidence for the effectiveness of AA for the symptomatic treatment of insomnia is limited. Further, rigorously designed trials are warranted to confirm these results." Lee MS, Shin BC, Suen LK, Park TY, Ernst E, Int. J. Clin. Pract. (25th August 2008)