Phondongnok, Saisamon, Pisaln Mairiang, Piyathida Kuhirunyaratn, Phuangphaka Sadee Nielsen, and Karnchanasri Singhpoo. 2018. “The Level of Anti HBs Antibody Titer After Booster Dose in Medical Students”. Srinagarind Medical Journal 33 (3):266-71. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/122239.