(Reproduced with permission from Amato AA, Russell JA (Reproduced with permission from Amato AA, Russell JA. Neuromuscular Disorders. New York: McGraw-Hill Medical, 2008.) Source: Neuromuscular Diseases, McGraw-Hill Specialty Board Review: Neurology, Second Edition Citation: Souayah N. McGraw-Hill Specialty Board Review: Neurology, Second Edition; 2014 Available at: http://neurology.mhmedical.com/DownloadImage.aspx?image=/data/Books/1055/ch5fg9.jpeg&sec=59589452&BookID=1055&ChapterSecID=59579873&imagename= Accessed: November 13, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved