Advances in science and technology have transformed the health of the populations of the developed world, with substantial increases in life expectancy and reductions in morbidity. These advances have not, however, touched the lives of the poorest people of the world--the billions living in developing countries. This Review Series on global health highlights the key factors contributing to inequity in health across the globe and the scientific questions that remain unanswered but are critical to creating effective and appropriate health solutions. The gaps in knowledge identified in this series point the way for scientists to contribute to a changed world.
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