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This example shows a crossover study, where subjects are given the period 1 treatment according to the first disease-assessment schedule until disease progression, then there is a rest period of 28 days prior to the start of period 2 treatment (i.e., re-baseline for period 2). The subjects are then given the period 2 treatment according to the second disease assessment schedule until disease progression.  This example also shows how two different reference/anchor dates can be used.

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