. 2014 Sep 30;16(5):446. doi: 10.1186/s13075-014-0446-8
© Di Giuseppe et al.; licensee BioMed Central Ltd. 2014
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 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.
Figure 1.
Flow chart of selection of studies for inclusion in the dose-response meta-analysis.