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Preferred Reporting Items for Systematic Reviews and Meta-Analyses diagram. Additional records identified by other sources included the following: Baksaas-Aasen et al (14), Furay et al (24), Gonzalez et al (13), Sixta et al (25), Kay et al (26), Kumar et al (27), Rao et al (28), and Webb et al (29). TBI = traumatic brain injury, TEG = thromboelastography, VHA = viscoelastic hemostatic assay.
