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Timeline of relevant dates in the study’s design. The index date (first date of coverage enrollment) must have been between January 1, 2000 and December 31, 2010 and within one year of a child’s birth year, which needed to be between the years 2000 and 2010. A minimum five years of continuous medical, pharmacy, and behavioral coverage were required to follow the index date for a child to be included in the study.
