American Academy of Neurology (AAN), Neurology, 6(56), p. 820-823, 2001
DOI: 10.1212/wnl.56.6.820-a
American Academy of Neurology (AAN), Neurology, 4(55), p. 565-569, 2000
DOI: 10.1212/wnl.55.4.565
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