We are seeing a decline and it's real and not due to study biases. Husbands' use of sex workers has changed — it's less often and with condoms. That's the only plausible explanation.

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Governments have to take tobacco seriously. The key message is that it is possible to avoid up to three million deaths a year.

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What our study shows is that safe sex campaigns do work.

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We are seeing a decline and it's real.

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