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Dr. Constantine wants to study hearing, language, and cognitive development in children. He tests infants and then retests them every year until they are 20 years old. He also begins to test a new group of infants a few years later. Again, Dr. Constantine tests these new infants and then retests them every year until they are 20 years old. Dr. Constantine looks for developmental trends and also compares the hearing, language, and cognitive development between the two groups. What research design is being used in this research?
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