Subjects: INFECTION risk factors; COMPARATIVE studies; CONFIDENCE intervals
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Subjects: INFECTION risk factors; RESPIRATORY infections; AGE distributionDENMARK
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Subjects: HIV infection risk factors; HIV infection transmission; BREASTFEEDINGUNITED States
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Subjects: HIV prevention; HIV infection risk factors; CONTENT analysisUNITED States
Subjects: DIAGNOSIS of HIV infections; HIV infection risk factors; HIV infection transmissionSOUTH Africa