title: Risk of open spina bifida.
authors.forename: D W
authors.initials: DW
authors.lastname: Hershey
mesh_terms: D005260:Female; D006801:Humans; D011247:Pregnancy; D012307:Risk Factors; D016137:Spina Bifida Cystica / Q000175:diagnosis* / Q000000981:diagnostic imaging; D016216:Ultrasonography, Prenatal; D000509:alpha-Fetoproteins / Q000032:analysis*
chemical_list: D000509:alpha-Fetoproteins