Residents of Durham County, N.C., are encouraged to take part in the largest ever long-term study of children's health and development undertaken in the United States. Researchers soon will begin enrolling participants in the National Children's Study, which will examine the effects of environmental influences on the health and development of 100,000 children across the United States, following them from before birth until age 21. The goal is to improve the health and well-being of children... 
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