Jaruphat Asawaplungkul, M.D. “Effectiveness of Pneumococcal Vaccine Among Chronic Respiratory Disease Monks in Priest Hospital”. Journal of The Department of Medical Services, vol. 45, no. 4, Mar. 2021, pp. 138-47, https://he02.tci-thaijo.org/index.php/JDMS/article/view/249798.