Video Analysis of Reported Concussion Events in the National Football League During the 2015-2016 and 2016-2017 Seasons. - Lessley, David J.; Kent, Richard W.; Funk, James R.; Sherwood, Christopher P.; Cormier, Joseph M.; Crandall, Jeff R.; Arbogast, Kristy B.; Myers, Barry S. (American Journal of Sports Medicine, 2018)