The incidence and the outcome of retained second twin in Benin City.
D005260:Female; D005313:Fetal Death; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D009549:Nigeria; D007744:Obstetric Labor Complications; D011247:Pregnancy; D011272:Pregnancy, Multiple; D013997:Time Factors; D014427:Twins