sentences:  He retired from the Nigerian university system in 1998, and was appointed in July 1999, an emeritus professor of obstetrics and gynaecology at the University of Port Harcourt.He is a recognised authority on anaemia, sickle cell disease and malaria in pregnancy.His researches on anaemia at Ibadan University led to the development of the solution to the serious life-threatening problem of extreme anaemia in late pregnancy.