«Frequency of Hepatitis B and C Co-Infection in Chronic Liver Disease Patients in Calabar, Cross River State, Nigeria» (2021) Nigerian Journal of Physiological Sciences, 31(1), с. 043–047. доступний у: https://ojshostng.com/index.php/njphysiologicalsciences/article/view/1851 (дата звернення: 25 Квітень 2026).