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accompaniment |
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accompaniment
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Carolyn Halpern and associates (page 239) focus on risk of STD acquisition, with particular attention to the co-occurrence of drug and sexual risk behaviors, and to differences in patterns of covariation between black and white youth. Because of the potential for co-occurrence of As and Sb and confounding effects from concurrent exposure, it has been suggested that Sb concentrations be measured in regions of the world where As concentrations are known to be elevated and to assess the potential impact of Sb on human health (Gebel 1998, 1999, 2000). An unexplored approach to identifying the natural reservoir of filoviruses is large-scale ecologic and geographic comparisons to detect patterns of co-occurrence and codistribution of viruses with potential hosts. |
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