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. Author manuscript; available in PMC: 2011 May 10.
Published in final edited form as: J Drug Issues. 2010 Dec;40(1):221–240. doi: 10.1177/002204261004000112

Figure 1.

Figure 1

Dynamic view on drug use and drug treatment over time points. Ai1, Ai2,…,Ai10 denote the amount of treatments received by the ith subject at each time point, while Di1, Di2,…,Di10 denote the amount of drug use by the subject at each time point.