Figure 2From: From prescription drug purchases to drug use periods – a second generation method (PRE2DUP)The work-flow of the core process. Red arrows illustrate the retrieval of a person’s next purchase of the same ATC code. The blue background marks the processing of a person’s single purchase of an ATC code. The green background shows the processing of stockpiling. Red numbers link to particular sections in the text. Thin arrows present dataflow, bold arrows logic.Back to article page