Sulaiman, M. A., D. S. Gumel, U. Z. Usman, A. P. Ocheni, Y. Abdulmumini, R. N. Adanze, and Y. M. Haruna. “Establishment of Reference Ranges for Serum Leptin and C-Peptide Using Enzymelinked Immmunosorbent Assay Method: A Preliminary Report”. Asian Journal of Medical and Biological Research, vol. 2, no. 3, Nov. 2016, pp. 483-7, doi:10.3329/ajmbr.v2i3.30122.