FILE - In this May 10, 2012 file photo, Dr. Lisa Sterman holds up a Truvada pill, an HIV treatment pill used to prevent infection in people at high risk of getting the AIDS virus, at her office in San Francisco. Research showing that the pill does not encourage risky sex and is effective even if people skip some doses was discussed Tuesday, July 22, 2014, at the International AIDS Conference in Melbourne, Australia. The research was published by the British journal Lancet Infectious Diseases (AP Photo/Jeff Chiu, File)
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