«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), сс. 043–047. доступно на: https://ojshostng.com/index.php/njphysiologicalsciences/article/view/1851 (просмотрено: 25 июнь 2026).