Bifactor Model of the Sport Concussion Assessment Tool Symptom Checklist: Replication and Invariance Across Time in the CARE Consortium Sample. - Brett, Benjamin L.; Kramer, Mark D.; McCrea, Michael A.; Broglio, Steven P.; McAllister, Thomas W.; Nelson, Lindsay D.; Hazzard Jr, Joseph B.; Kelly, Louise A.; Ortega, Justus; Port, Nicholas; Pasquina, Paul F.; Jackson, Jonathan; et al. (American Journal of Sports Medicine, 2020)