Stability of Folate and Vitamin B12 in Human Serum after Long-Term Storage: A Follow-Up after 13 Years
Correlation between the mean vitamin B12 concentrations at and after storage for 1, 8, and 13 years at −70°C. The correlation lines have the following equations: y = 0.829x + 2.80 , y = 0.600x + 33.7 , and y = 0.401x + 48.5 for 1, 8, and 13 years, respectively.
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