In spite of the medical advances of the twentieth century, the world still faces disease burdens for which medicines do not exist, or could be improved. The most pressing needs - new drugs for dealing with cancer, better anti-infectives and the like - vary from region to region. But the economic boundaries that currently define the differing needs of the developed and developing worlds are neither fixed nor clearly defined. HIV, for example, is a global problem. As developing countries become more affluent, they too will have to confront the disorders that already afflict the rich.
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