RT Journal Article SR Electronic T1 The MS symptom and impact diary (MSSID): psychometric evaluation of a new instrument to measure the day to day impact of multiple sclerosis JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 526 OP 527 DO 10.1136/jnnp.2003.032367 VO 75 IS 4 A1 Beaumont, J G YR 2004 UL http://jnnp.bmj.com/content/75/4/526.abstract AB