The study, started in the 1970s in Matlab, compared a group with access to contraception and birth-control education to a similar group that did not have access to those things.

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Control access to the MFP and its functions at the group, individual, and activity level.

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In 1972, Campbell's university began a project to track the success of a group of preschoolers and a similar control group of kids who were not given access to preschool.

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