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Principal investigators’ ratings of levels of knowledge about injection drug users (IDUs) at initiation and end of rapid assessment and response (RAR).
Note. HBV = hepatitis B virus. At the Minsk site, data on time 1 characteristics of IDUs and on time 2 sexual risk behaviors were missing; at the Beijing site, data on time 2 prevalence of hepatitis C virus (HCV) infection were missing.
