The Influence of Levodopa and the COMT Inhibitor on Serum Vitamin B12 and Folate Levels in Parkinson’s Disease Patients von Triantafyllou, N.I., Kararizou, E., Angelopoulos, E., Tsounis, S., Boufidou, F., Evangelopoulos, M.E., Nikolaou, C., Vassilopoulos, D.

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