1Department of Neurology, University of Wisconsin School of Medicine and Public Health, 1685 Highland Avenue, Madison, WI 53705, USA Tel.: +1 608 263 5445; fax: +1 608 263 0412. 2Neuromuscular Diseases Unit, IRCCS Foundation, ‘Carlo Besta’ Neurological Institute, Milan, Italy E-mail address:[email protected] Submitted and accepted September 10, 2010.
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Backonja et al. (2010) studied this question.
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