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. 2022 Feb 8;13:751. doi: 10.1038/s41467-021-27942-w

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Fig. 4 — a Cumulative number of colleges involved in the cluster. Cases included in this cluster were between a number of colleges early during the university term. b Frequency of cases involved in the cluster by year of study. c Frequency of cases involved in the cluster by course type. Source data are provided as a Source Data file.