<p><b>Copyright information:</b></p><p>Taken from "Early exit: Estimating and explaining early exit from drug treatment"</p><p>http://www.harmreductionjournal.com/content/5/1/13</p><p>Harm Reduction Journal 2008;5():13-13.</p><p>Published online 25 Apr 2008</p><p>PMCID:PMC2391146.</p><p></p