Seasonal variation of 25-hydroxyvitamin D among non-hispanic black and white pregnant women from three US pregnancy cohorts

1. Luque-Fernandez, M.A.
2. Gelaye, B.
3. Vanderweele, T.
4. Ferre, C.
5. Siega-Riz, A.M.
6. Holzman, C.
7. Enquobahrie, D.A.
8. Dole, N.
9. Williams, M.A.