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Effectiveness of a Pay-It-Forward Intervention Compared with User-Paid Vaccination to Improve Influenza Vaccine Uptake and Community Engagement among Children and Older Adults in China: A Quasi-Experimental Pragmatic Trial

Effectiveness of a Pay-It-Forward Intervention Compared with User-Paid Vaccination to Improve Influenza Vaccine Uptake and Community Engagement among Children and Older Adults in China: A Quasi-Experimental Pragmatic Trial
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