RT Journal Article SR Electronic T1 The real onset of amyotrophic lateral sclerosis JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 593 OP 593 DO 10.1136/jnnp.2011.245761 VO 82 IS 6 A1 Andrew Eisen YR 2011 UL http://jnnp.bmj.com/content/82/6/593.abstract AB