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1 Washington University School of Medicine, Department of Neurology, St. Louis, United States 2 Erasmus Medical Center, Sophia, Rotterdam, The Netherlands 3 University of Pittsburgh, Department of Neurology, Pittsburgh, United States 4 Children’s National Medical Center, Washington, DC, United States 5 Institut de Myologie, Groupe Hospitalier Pitie-Salpetriere, Paris, France 6 Tower Hematology Oncology, Beverly Hills, United States 7 Mount Sinai School of Medicine, New York, United States 8 Genzyme Corporation, Cambridge, United States PII: S0960-8966(08)00215-0 doi:10.1016/j.nmd.2008.06.053 © 2008 Published by Elsevier Inc. | ||||||||||||||||||||