by Onyeka, I N, Ilika, A L, Ilika, F N, Umeh, D C, Onyibe, R I, Okoye, C J, Diden, G, Onubogu, C U
Published in Nigerian journal of clinical practice (01.11.2014)

by Ike, P.O., Folley, D.E., Umeh, C.D., Agwu, K.K., Chithambo, M.L., Chikwembani, S., Ezema, Fabian I.
Published in Journal of luminescence (01.10.2020)

by Umeh, David C
Published in Journal of health education (01.10.1995)