Sexual activity and its consequences in the teenager.
D000032:Abortion, Therapeutic; D000293:Adolescent; D000367:Age Factors; D001724:Birth Weight; D005260:Female; D006801:Humans; D008428:Maternal Mortality; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology; D012725:Sexual Behavior; D012749:Sexually Transmitted Diseases; D006113:United Kingdom; D002583:Uterine Cervical Neoplasms