TY  - GEN
AU  - Bodnar,Lisa M
AU  - Platt,Robert W
AU  - Simhan,Hyagriv N
TI  - Early-pregnancy vitamin D deficiency and risk of preterm birth subtypes
SN  - 1873-233X
PY  - 2015///0515
KW  - Adult
KW  - Case-Control Studies
KW  - Cohort Studies
KW  - Female
KW  - Humans
KW  - Incidence
KW  - Pennsylvania
KW  - epidemiology
KW  - Pregnancy
KW  - Premature Birth
KW  - blood
KW  - Prevalence
KW  - Vitamin D
KW  - analogs & derivatives
KW  - Vitamin D Deficiency
KW  - Young Adult
N1  - Publication Type: Journal Article; Research Support, U.S. Gov't, P.H.S
UR  - https://doi.org/10.1097/AOG.0000000000000621
ER  -