Knowledge, practice and effectiveness of contraception in Belgium.
D000328:Adult; D001290:Attitude; D001530:Belgium; D003267:Contraception; D003270:Contraceptive Agents; D003273:Contraceptive Devices; D003710:Demography; D005260:Female; D006801:Humans; D011247:Pregnancy; D011795:Surveys and Questionnaires
D003270:Contraceptive Agents