First, determine what amount you receive this medicine. For the study, it offers two products: the preparation A and a reference or pill (placebo) inactive call. The patient will be assigned to one of them, and does not know the doctor who conducted the study, neither the patient. The choice allows the computer using the technique of random numbers. This is known in advance that the patient will not be hurt because of the effectiveness or ineffectiveness of the drug to be tested. This herd in the center - the researcher who has no relation to drug selection or conductive treatment. But he has the ability to assess the effect of exposure to the drug. There were times when the study was stopped because of the complete inefficiency and beyond, the harmfulness of drug testing, or vice versa, the drug was so effective that more research would be contrary to the ethics.

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