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Caldwell, C

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[34] Neurological symptoms: sensory or motor deficiencies (absent reflexes, diminished vibration or soft touch sensation) and subacute combined degeneration of the spinal cord

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Other reports, however, propose that an increase in plasma or serum MMA during pregnancy is normal and does not reflect a low vitamin B12 status and caution that serum MAA may not be a reliable biomarker of vitamin B12 status among pregnant women (Bae et al., 2015)