Tracheostomy, In Guillain- Barre SyndromeMuscle & Nerve 22:1058-1062, Lawn,N.D.&Wijdicks,E.F.M., 1999
Subclinical Neuropathy Associated With Chronic Obstructive Pulmonary DiseaseArch Neurol 38:639-642, Faden,A.,et al, 1981