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(A) Distribution of years of follow-up included in final analysis for both athlete groups, with 48 of 63 football subjects (76%) and 23 of 34 volleyball subjects (68%) having two or greater time points more than 4 months apart, (B) Distribution of enrollment year for each sport, where the year denotes the first year in school (starting with freshmen year) of usable data (i.e. with a usable hippocampal segmentation) for each subject. Color image is available online.
