Akpan, U., Bassey, I., Nwatu, N., & Offor, S. (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/https://doi.org/10.23921/amp.2018v2i2.298656