“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), صص 043–047. قابل دسترس در: https://ojshostng.com/index.php/njphysiologicalsciences/article/view/1851 (دسترسی: 25 ژوئن 2026).