title: Regarding the need, or lack thereof, of a comparator group for pregnancy registries.
authors: Rachel
authors: R
authors: Charlton
authors: Marianne
authors: M
authors: Cunnington
authors: John
authors: J
authors: Weil
authors: Corinne
authors: C
authors: de Vries
mesh_terms: D000328:Adult; D000013:Congenital Abnormalities / Q000453:epidemiology*; D016208:Databases, Factual; D005260:Female; D006801:Humans; D011159:Population Surveillance / Q000379:methods*; D011247:Pregnancy; D011634:Public Health; D040442:Public Health Informatics; D012042:Registries / Q000706:statistics & numerical data*