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Subjects
- Sheep[remove]8
- Sheep Diseases2
- Acquired Immunodeficiency Syndrome -- prevention & control1
- Condoms1
- Congenital Abnormalities1
- Cysticercus1
- Erectile Dysfunction -- drug therapy1
- HIV Infections -- prevention & control1
- Natural History1
- Phosphoric Acids -- therapeutic use1
- Safe Sex1
- Sleep Initiation and Maintenance Disorders1
- Tissue Extracts -- therapeutic use1
- Vasodilator Agents -- therapeutic use1