Trend in legitimate and illegitimate multiple births.
Parazzini
F
F
Restelli
S
S
Moroni
S
S
Crosignani
P G
PG
D001723:Birth Rate / Q000639:trends*; D005260:Female; D006801:Humans; D007086:Illegitimacy / Q000639:trends*; D007231:Infant, Newborn; D007558:Italy / Q000453:epidemiology; D011247:Pregnancy; D011272:Pregnancy, Multiple / Q000706:statistics & numerical data