Amanda C Guidon1, Vern C Juel2. 1. From the Division of Neuromuscular Medicine, Department of Neurology (A.C.G.), Massachusetts General Hospital, Harvard Medical School, Boston; and Division of Neuromuscular Medicine, Department of Neurology (V.C.J.), Duke University Medical Center, Duke University, Durham, NC. aguidon@partners.org. 2. From the Division of Neuromuscular Medicine, Department of Neurology (A.C.G.), Massachusetts General Hospital, Harvard Medical School, Boston; and Division of Neuromuscular Medicine, Department of Neurology (V.C.J.), Duke University Medical Center, Duke University, Durham, NC.