%0 Journal Article %A D Jefferson %T Diagnostic Tests in Neurology %D 1989 %R 10.1136/jnnp.52.5.690-b %J Journal of Neurology, Neurosurgery & Psychiatry %P 690-691 %V 52 %N 5 %U https://jnnp.bmj.com/content/jnnp/52/5/690.3.full.pdf