Li, Q., Huang, Z., Chen, J., Wang, J., Li, D., Chen, X., . . . Xu, D. R. Effectiveness of pay it forward intervention compared to free and user-paid vaccinations on seasonal influenza vaccination among older adults across seven cities in China: Study protocol of a three-arm cluster randomized controlled trial. BMC.
Chicago Style (17th ed.) CitationLi, Qing-Qing, et al. Effectiveness of Pay It Forward Intervention Compared to Free and User-paid Vaccinations on Seasonal Influenza Vaccination Among Older Adults Across Seven Cities in China: Study Protocol of a Three-arm Cluster Randomized Controlled Trial. BMC.
MLA (9th ed.) CitationLi, Qing-Qing, et al. Effectiveness of Pay It Forward Intervention Compared to Free and User-paid Vaccinations on Seasonal Influenza Vaccination Among Older Adults Across Seven Cities in China: Study Protocol of a Three-arm Cluster Randomized Controlled Trial. BMC.