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Okpa, Henry Ohem, Emmanuel Edet Effa, Sidney Kelechi Oparah, John Austin Chikezie, Elvis Mbu Bisong, Patrick Ntui Mbu, and Daniel Emmanuel Otokpa. "Intradialysis Blood Pressure Changes Among Chronic Kidney Disease Patients On Maintenance Haemodialysis in a Tertiary Hospital South - South Nigeria: A 2 Year Retrospective Study." Pan Afr Med J 2019.

Okpa, Henry Ohem, et al. "Intradialysis Blood Pressure Changes Among Chronic Kidney Disease Patients On Maintenance Haemodialysis in a Tertiary Hospital South - South Nigeria: A 2 Year Retrospective Study." Pan Afr Med J 2019.