First intercourse, contraception and first pregnancy in Flanders: changes during the past 30 years.
Lodewijckx
E
E
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001530:Belgium; D003075:Coitus; D003267:Contraception / Q000639:trends*; D005260:Female; D006801:Humans; D011247:Pregnancy