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. Author manuscript; available in PMC: 2008 Mar 1.
Published in final edited form as: Am J Prev Med. 2007 Jan 22;32(3):231–238. doi: 10.1016/j.amepre.2006.11.003

Figure 1. Participant flow.

Figure 1

*Approximately 10% (n =14) of baseline participants were selected for lack of drug use reporting or risk, and removed at follow-up, in order to enhance participant protection. Flow diagram shows drug-using participants only.