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. 2015 Mar 19;12:E35. doi: 10.5888/pcd12.140377

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In this systematic review, 132 studies were identified in an initial electronic database search; 132 studies underwent abstract review; 120 studies were excluded due to irrelevancy; 12 studies were retained for full text review; 2 studies were excluded due to redundancy; 3 studies were identified from the reference list of reviewed articles; 13 studies were included in our review. — Selection of studies in review of articles on exposure to secondhand smoke among pregnant women in China, 1995–2012.