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In the review by Rockwood in the May issue of JNNP (K Rockwood. Size of the treatment effect on cognition of cholinesterase inhibition in Alzheimer’s disease. J Neurol Neurosurg Psychiatry 2004;75:677–85) there is an incorrect entry on the x axis each of the tables in figure 1. The sixth entry should read 0.25, instead of 0.5. The corrected table can be viewed at http://www.jnnp.bmjjournals.com/cgi/content/full/75/5/677/DC1
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