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. 2017 Oct 10;89(15):1578–1583. doi: 10.1212/WNL.0000000000004489

Figure 2. Variation in 25-hydroxyvitamin D (25[OH]D) levels by month and year of collection.

Figure 2

(A) Variation in 25(OH)D levels by month of serum sample collection. (B) Average 25(OH)D levels by calendar year of sample collection. *Only 1 sample collected in 2009.