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Imagine that the National Institutes of Health (NIH) decided to start a National Children's Study this year. A group of 100,000 pregnant mothers and their

Imagine that the National Institutes of Health (NIH) decided to start a National Children's Study this year. A group of 100,000 pregnant mothers and their partners enrolled in several State Health Insurance programs have been recruited into the study. They and their children will be followed for 25 years. Many early childhood exposures will be measured. What kind of study design is this?

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