Manipulation, SpinalManipulation, ChiropracticChiropracticPost-Traumatic HeadacheManipulation, OrthopedicSpinal CordMedicare Part BHypesthesiaLow Back PainMusculoskeletal ManipulationsLumbosacral RegionManipulation, OsteopathicVertebral Artery DissectionSpinal DiseasesBack PainZygapophyseal JointSpinal Cord InjuriesPain MeasurementNerve Fibers, UnmyelinatedLumbar VertebraeTreatment Outcome