Degenerative Diseases of the Nervous System, Werdnig-Hoffman Disease, Spinal Muscular Atrophy
Adams & Victors Principles of Neurology, Chp 39, pg 1116, Ropper, A.H.,et al, 2014
Neurodegenerative Disease of Infancy & Childhood
Ann Neurol 13:351-364, Dyken,P.,et al, 1983