Akpan, U. O., Bassey, I. E., Nwatu, N. N., & Offor, S. J. (2018). A comparative study on ABO blood group and fertility hormones in infertile women in Calabar, Southern Nigeria. Annals of Medical Physiology, 2(2), 19–24. https://doi.org/10.23921/amp.2018v2i2.298656