R. N. Oputa, C. Ekwueme, J. N. Amah, S. Chinenye, and C. J. Nwaokoro, “Connecting peptide (c-peptide) and the duration of diabetes mellitus amongst patients, at the Federal Medical Centre (FMC), Owerri, southeast, Nigeria”, RJHS, vol. 4, no. 1, pp. 9–14, Oct. 2023.