Komitova, Radka T, Ani K Kevorkyan, Maria V Atanasova, Aneta V Ivanova, and Elica Golkocheva-Markova. “Booster Immunity – Diagnosis of Chronic Hepatitis B Viral Infection”. The Journal of Infection in Developing Countries 13, no. 03 (March 31, 2019): 255–260. Accessed April 26, 2024. https://jidc.org/index.php/journal/article/view/32040457.