Regarding the need, or lack thereof, of a comparator group for pregnancy registries.
Charlton
Rachel
R
Cunnington
Marianne
M
Weil
John
J
de Vries
Corinne
C
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*