Sansanasupapong, D., & Somronthong, R. (2017). Perception and Willingness to Obtain Influenza Vaccination among Healthcare Staff and Elderly Group : a Case Study at the Public Hospital, Nakhonchaisri District, Nakhonpathom Province. Journal of Health Research, 26(5), 235–241. Retrieved from https://he01.tci-thaijo.org/index.php/jhealthres/article/view/85467