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The coefficient was 0.042 (95% CI 0.081 to 0.004)
This approach was chosen because clinical cutoffs are based on disease-related epidemiological data and biomarkers unrelated to fertility
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Factors such as initial B12 levels, underlying medical conditions, certain medications, advanced age, and injection frequency can affect the absorption and utilization of B12, possibly shortening the duration of action
This depletion can lead to anemia, and also an increased risk that their breastfed infants become vitamin deficient
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