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. 2014 Jun 24;14:643. doi: 10.1186/1471-2458-14-643

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Copyright © 2014 Beydoun et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Meta-analysis of selected risk and protective factors for incident AD (n = 31). (A) Education. (B) Smoking status. (C) Physical activity. (D) Homocysteine. (E) n3 fatty acids.