Association between maternal ABO blood group and preeclampsia: a prospective cohort study by Zebulon C. Okechukwu, George U. Eleje, Joseph I. Adinma, Gerald O. Udigwe, Innocent I. Mbachu, Chukwuemeka O. Ezeama, Nkiru N. Ezeama, Chukwudi A. Ogabido, Chukwunwendu F. Okeke, Chidinma C. Okafor, Stella C. Okechukwu, Chinedu L. Olisa, Chigozie G. Okafor

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