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A 16-year-old girl from Surinam presented with mental deterioration and severe paraparesis with areflexia and bilateral Babinski signs. Laboratory examination showed a hyperhomocysteinemia that was caused by 5,10-methylene-tetrahydrofolate reductase (MTHFR) deficiency. In addition, urine samples contained large amounts of arsenic. An open bag with the(More)
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