Okwara, E. C., and V. C. Wakwe. “Serum Levels of Zinc and Copper in the Elderly in Owerri Metropolis: https://doi.Org/10.60787/NMJ-64-1-234”. Nigerian Medical Journal, vol. 64, no. 1, May 2023, p. 130, doi:10.60787/nmj.v64i1.234.