title: Limb defects and gestational age at chorionic villus sampling.
authors.forename: R S
authors.initials: RS
authors.lastname: Olney
authors.forename: M J
authors.initials: MJ
authors.lastname: Khoury
authors.forename: L D
authors.initials: LD
authors.lastname: Botto
authors.forename: P
authors.initials: P
authors.lastname: Mastroiacovo
mesh_terms: D016022:Case-Control Studies; D015193:Chorionic Villi Sampling / Q000009:adverse effects*; D015331:Cohort Studies; D000013:Congenital Abnormalities / Q000453:epidemiology / Q000209:etiology; D005260:Female; D005865:Gestational Age; D006801:Humans; D007558:Italy / Q000453:epidemiology; D017880:Limb Deformities, Congenital; D011247:Pregnancy; D012307:Risk Factors; D014481:United States / Q000453:epidemiology