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Additional file 1 Table S1. Comparison of baseline characteristics and birth outcomes based on maternal influenza infection during seasonal epidemic and pandemic periods. Table S2. Adverse impact of maternal influenza infection on the birth outcomes during seasonal epidemic (2007–2008 years), stratified by pregnancy periods. Table S3. Adverse impact of maternal influenza infection on the birth outcomes during pandemic period (2009–2010 years), stratified by pregnancy periods. Table S4. Long-term impact of maternal influenza infection on the offspring: subgroup analysis (seasonal epidemic and pandemic periods)