The validity of the extension-rotation test as a clinical screening procedure before neck manipulation: a secondary analysis.
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D002561:Cerebrovascular Disorders / Q000209:etiology*; D002574:Cervical Vertebrae; D002684:Chiropractic / Q000009:adverse effects*; D006801:Humans; D007258:Informed Consent; D008403:Mass Screening / Q000592:standards*; D016059:Range of Motion, Articular; D015203:Reproducibility of Results