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Validity of a measure of the frequency of headaches with overt neck involvement, and reliability of measurement of cervical spine anthropometric and muscle performance factors Leigh Blizzard, MEC, Karen A. Grimmer, PhD, Terence Dwyer, MD Archives of Physical Medicine and Rehabilitation Volume 81, Issue 9, Pages (September 2000) DOI: /apmr Copyright © 2000 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions
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Fig. 1 Age- and sex-adjusted mean differences between questionnaire and diary reports of monthly frequency of headaches with overt neck involvement, classified by frequency of recreational sport during the diary month. Archives of Physical Medicine and Rehabilitation , DOI: ( /apmr ) Copyright © 2000 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions
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