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. 2014 Apr 8;12:60. doi: 10.1186/1741-7015-12-60

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Copyright © 2014 Lara 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-regression analysis of effects of number of contacts during interventions on fruit and vegetable intakes. Slope = 3.80, Q = 36.93, d.f. = 1, P <0.0001. The circle size reflects the weight that a study obtained in the meta-regression.