[cdc trends in hiv and std related risk behaviors among high school students united states 1991 2007 mmwr] in atext

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atext	count	semantic flow ™
cdc trends in hiv and std related risk behaviors among high school students united states 1991 2007 mmwr	2	0.14	urls with [cdc trends in hiv and std related risk behaviors among high school students united states 1991 2007 mmwr] in atext