PT - JOURNAL ARTICLE AU - I S J Merkies AU - R A C Hughes TI - The measurement of disease AID - 10.1136/jnnp.2010.206409 DP - 2010 Sep 01 TA - Journal of Neurology, Neurosurgery & Psychiatry PG - 943--943 VI - 81 IP - 9 4099 - http://jnnp.bmj.com/content/81/9/943.short 4100 - http://jnnp.bmj.com/content/81/9/943.full SO - J Neurol Neurosurg Psychiatry2010 Sep 01; 81