Usychenko, K., and Y. Berdnyk. “Relationship of Cytokine Gene Polymorphism and the Development of Liver Fibrosis in Patients With Chronic Hepatitis B&C”. Journal of Education, Health and Sport, vol. 13, no. 2, Feb. 2023, pp. 339-48, doi:10.12775/JEHS.2023.13.02.048.