A longitudinal study of children at Igbo-Ora, Nigeria.
D001723:Birth Rate; D002662:Child Health Services / Q000706:statistics & numerical data; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007231:Infant, Newborn; D008297:Male; D008457:Measles / Q000401:mortality; D009549:Nigeria; D012189:Retrospective Studies; D012621:Seasons