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Plot of observed red blood cell (RBC) folate concentrations over time and model-estimated lines that were fitted to the data with the use of nonlinear regression, allowing for separate plateaus for each intervention group but with the assumption of the same rate constant (k) for both treatment groups. Placebo (A), 140-μg folic acid/d (B), and 400-μg folic acid/d (C) groups.
