Question: How would you describe a study comparing treatments A, B, C and D in which each subject is randomized to one of the treatment sequences

How would you describe a study comparing treatments A, B, C and D in which each subject is randomized to one of the treatment sequences in the following array? Period 1 Period 2 Period 3 Period 4 Sequence 1 A B C D Sequence 2 B C D A Sequence 3 C D A B Sequence 4 D A B C

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