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. 2013 Jun 6;10:E91. doi: 10.5888/pcd10.120230
Month of Clinic Visit Plasma Vitamin D, nmol/L
Men Women
1 53.3 63.8
2 54.6 62.8
3 68.0 61.6
4 64.2 66.9
5 68.5 70.8
6 71.4 71.2
7 79.8 72.6
8 80.1 75.2
9 65.7 70.2
10 67.6 68.4
11 69.1 66.6
12 61.3 71.7