Abstract
No study is better than the quality of its data. Data in clinical trials are collected from several sources – interviews, questionnaires, participant examinations, or laboratory determinations. Also, data that have been collected and evaluated by someone outside the study may be used in a trial; for example, diagnoses obtained from death certificates or hospital records.
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Friedman, L.M., Furberg, C.D., DeMets, D.L. (2010). Data Collection and Quality Control. In: Fundamentals of Clinical Trials. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-1586-3_11
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