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Researchers want to estimate the association between environmental lead exposure and cognitive deficits in children. Among all children who received preventive care at 5 local pediatric clinics over the last 5 years, they identify 20 children diagnosed with cognitive deficits and 40 without the diagnosis. The researchers then review the patients' medical records and calculate the distance between the patients' residence and known lead-contaminated geographic areas. Which of the following best describes the study design used by the researchers?
Diagnosis
The identification of the nature and cause of a certain phenomenon, often used in the context of medical conditions or technical problems.
Evaluate Progress
The process of assessing the advancement or development towards achieving a specific goal, objective, or standard.
Psychological Testing
The use of standardized tests to measure an individual's mental and/or emotional functioning.
Ethical Standards
Guidelines or principles designed to govern behavior and conduct, particularly in professional settings, to ensure fairness, integrity, and respect.
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