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* You are reading a journal article that describes a multi-center clinical trial comparing a new treatment for abnormal uterine bleeding to a control. In order to assign patients to a group, researchers picked a marble from an urn, blue for treatment, white for control. Authors reported an 8% dropout rate in the treatment arm and a 9% drop out rate in the control arm. Participants who did not complete treatment were analyzed in the group to which they were originally assigned.

Which of the following would be a criticism of this study design?

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