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. 2016 Sep 9;95(36):e4845. doi: 10.1097/MD.0000000000004845

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Copyright © 2016 the Author(s). Published by Wolters Kluwer Health, Inc. All rights reserved.

This is an open access article distributed under the Creative Commons Attribution-No Derivatives License 4.0, which allows for redistribution, commercial and non-commercial, as long as it is passed along unchanged and in whole, with credit to the author. http://creativecommons.org/licenses/by-nd/4.0

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Table 2.

Nonsmokers: characteristics of studies included in the meta-analysis.

3.1.