Once patients left the study, there was no way for researchers to control what drugs they took, and those medicines may have neutralized the beneficial effects of the study drugs.
一旦患者左研究中，却没有办法，为科研人员控制哪些药物了，这些药物可能有瓦解的有利影响，研究药物。
Once patients left the study, there was no way for researchers to control what drugs they took, and those medicines may have neutralized the beneficial effects of the study drugs.
一旦患者左研究中，却没有办法，为科研人员控制哪些药物了，这些药物可能有瓦解的有利影响，研究药物。
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