Assertion: botulinum toxin's effect | /r/CapableOf | cross over trial
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Source sentences:
text: In multiple sclerosis the beneficial effect of BTX-A on focal spastic muscle contractions was shown in a double blind, cross over trial involving nine people with chronic multiple sclerosis.82 Injection into the adductor muscle group resulted in statistically significant reductions in spasticity and improvements in ease of nursing care.