sentences:  The Zaria Maternity Survey by a team Harrison led, was his most influential work.Between 1976 and 1979, Harrison and his colleagues collected data on over 22,000 births that when analysed, threw open the problems of traditional forms of interference, of adolescent marriage and pregnancy, of women's inferior status, and of their neglect in pregnancy, labour and afterwards, and of the consequences of this neglect especially high levels of both maternal mortality and VVF.The strongest message that came through this work was that both maternal and perinatal health benefitted hugely when women were educated, but not when they were illiterate.