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Researchers began a study in 1960 with a group of 5,500 healthy adults living in the midwest. at that time they asked all study participants about their eating habits. all new cases of coronary heart disease were recorded in this group between 1960-1995. this is an example of a:

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Researchers began a study in 1960 with a group of 5,500 healthy adults living in the midwest. at tha...

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