| http://www.w3.org/ns/prov#value | - The primary safety endpoints will be measured by the frequency of Grade 3 or 4 renal or hepatic function laboratory toxicities or clinical toxicities in blinded tenofovir and placebo arms, as defined by the Gilead-modified NIAID Adult Common Toxicity Tables, and which cannot be directly attributed to a cause other than study medications; and the frequency of adverse clinical events in tenofovir an
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