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Scientists at University of Washington have attempted to improve upon previous population models developed by the United Nations and the Austrian Wittgenstein Centre by using different calculation techniques for two key factors - fertility and migration.

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HIV pre-exposure prophylaxis (PrEP) is a medication used for HIV prevention, and should be used by people who are routinely in danger of acquiring HIV (for example, those who have an HIV positive partner, or those who inject drugs). In the United States, about 200,000 women are candidates for PrEP, although only 50,000…