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Arai Y, Takayama M, Abe Y, et al
Mov Disord off J Mov Disord Soc 35:14661471 Comi C et al (2014) Peripheral nervous system involvement in Parkinsons disease: evidence and controversies
Genetic factors : Variants in genes like MTHFR or COMT may alter how your body processes B12 and related nutrients
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