Whiplash InjuriesNeck PainInsurance, AccidentAccidents, TrafficNeck MusclesMortalityCornell Medical IndexNeck InjuriesSaskatchewanAccessory NerveHypesthesiaHospital MortalityTreatment OutcomeCervical VertebraeAccelerationAccessory Nerve DiseasesWounds and InjuriesTime FactorsCause of DeathFollow-Up StudiesVertigoProspective StudiesCraniocerebral TraumaHeadacheProportional Hazards ModelsRetrospective StudiesCohort StudiesDizzinessPhysical Therapy ModalitiesRisk FactorsBrain InjuriesUnited StatesRisk AssessmentRandomized Controlled Trials as TopicCardiovascular DiseasesSurvival AnalysisOutcome Assessment (Health Care)