title: Frequency of neural tube defects and Down syndrome in the same sibship: analysis of the Spanish ongoing case-control study.
authors.forename: María Luisa
authors.initials: ML
authors.lastname: Martínez-Frías
authors.forename: Laura
authors.initials: L
authors.lastname: Rodríguez
authors.forename: Fermina
authors.initials: F
authors.lastname: López-Grondona
authors.forename: Eva
authors.initials: E
authors.lastname: Bermejo
authors.forename: Elvira
authors.initials: E
authors.lastname: Rodríguez-Pinilla
authors.forename: Jaime L
authors.initials: JL
authors.lastname: Frías
mesh_terms: D016022:Case-Control Studies; D015897:Comorbidity; D004314:Down Syndrome / Q000453:epidemiology / Q000235:genetics*; D006801:Humans; D009436:Neural Tube Defects / Q000453:epidemiology / Q000235:genetics*; D035781:Siblings; D013030:Spain / Q000453:epidemiology