Contraceptive practices of white unmarried university students: the significance of four years at one university.
D003075:Coitus; D003267:Contraception; D003273:Contraceptive Devices; D003276:Contraceptives, Oral; D005260:Female; D006801:Humans; D008297:Male; D009657:North Carolina; D011247:Pregnancy; D013223:Statistics as Topic; D013334:Students; D011795:Surveys and Questionnaires; D014495:Universities; D044465:White People
D003276:Contraceptives, Oral