Patterns of contraceptive failures: the role of motivation re-examined.
D000293:Adolescent; D000328:Adult; D003268:Contraception Behavior; D003858:Dependency, Psychological; D005006:Ethnicity; D005260:Female; D005639:Frustration; D006801:Humans; D009042:Motivation; D011247:Pregnancy; D011275:Pregnancy, Unwanted