Barriers and boundaries.
D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control / Q000635:transmission; D003267:Contraception / Q000379:methods*; D003271:Contraceptive Agents, Female / Q000008:administration & dosage; D003274:Contraceptive Devices, Female / Q000145:classification; D003275:Contraceptive Devices, Male; D004992:Ethics, Medical; D005260:Female; D006801:Humans; D008297:Male; D012106:Research; D012749:Sexually Transmitted Diseases / Q000517:prevention & control* / Q000635:transmission
D003271:Contraceptive Agents, Female