Fig. 1From: Clinical Outcome Following Concussion Among College Athletes with a History of Prior Concussion: A Systematic ReviewSystematic literature search (PRISMA). Note: There was a mistake in the reporting of the number of records identified in the original search from 2016, as published by Iverson et al. in 2017. The initial search in 2016 yielded 4746 records, as noted in this figure.Back to article page