Danpradit, Prapaiwan, and Natthanya Prasitsary. 2023. “Effects of the Health Belief Model Educational Program on Perceptions and Preventive Behaviors of COVID-19 in Secondary School Students : Effect of Educational Program on Prevention Behavior of COVID-19”. Vajira Medical Journal : Journal of Urban Medicine 67 (3):575-82. https://doi.org/10.14456/vmj.2023.19.