Maternal mortality Aid worker 1 Circulatory system diseases 1 Developing world 1 Direct causes 1 Human rights 1 Hypertension 1 Indirect causes 1 Industrial cities 1 Infant mortality 1 Join point trends 1 Lagos 1 Low- and middle-income countries 1 MDGs 1 Maternal death 1 Nigeria 1 Nosogeographic complexes 1 Nosogeographic situation 1 Sub-Saharan Africa 1 Women's rights 1