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Segmented linear regression of monthly aggregate HIV tests among PrEPX participants and HIV-negative GBM not participating in PrEPX attending 2 sexual health and 3 primary care study sites, January 1, 2015 to March 31, 2018. Gray dots: estimated number of tests per month; Blue line: trend in testing; vertical dashed line: model interruption at PrEPX commencement July 2016.
