Bodnar, Lisa M <br/><br/>
Early-pregnancy vitamin D deficiency and risk of preterm birth subtypes.  [electronic resource] 

 -  Obstetrics and gynecology  Feb 2015 
 - 439-447 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, U.S. Gov't, P.H.S. 
<br/><br/><label>ISSN: </label>1873-233X 
<br/><br/><label>Standard No.: </label>10.1097/AOG.0000000000000621  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adult<br/>Case-Control Studies<br/>Cohort Studies<br/>Female<br/>Humans<br/>Incidence<br/>Pennsylvania--epidemiology<br/>Pregnancy<br/>Premature Birth--blood<br/>Prevalence<br/>Vitamin D--analogs & derivatives<br/>Vitamin D Deficiency--blood<br/>Young Adult