acute motor sensory axonal neuropathysensory axonal neuropathyaxonal demyelinating neuropathyaxonal peripheral neuropathy treatmentidiopathic axonal neuropathysevere axonal neuropathychronic axonal neuropathydistal axonal neuropathysensory motor axonal polyneuropathyaxonal type neuropathyacute axonal neuropathyaxonal loss neuropathy