RT Journal Article SR Electronic T1 MUSCLES—TESTING AND FUNCTION JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 158 OP 158 DO 10.1136/jnnp.36.1.158 VO 36 IS 1 A1 J. A. Simpson YR 1973 UL http://jnnp.bmj.com/content/36/1/158.1.abstract AB