Iain DWilkinson, SarahLunn, Katherine AMiszkiel, Robert FMiller, Martyn N JPaley, IanWilliams, Roger J SChinn, Margaret AHall-Craggs, Stanton PNewman, Brian EKendall, Michael J GHarrison
Journal of Neurology, Neurosurgery & Psychiatry Oct 1997, 63 (4) 477-482; DOI: 10.1136/jnnp.63.4.477