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Epidemiology & Population Health
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Condoms
Verbal Behavior
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Streptococcus pneumoniae
HIV Seropositivity
Mid-Atlantic Region
Puerto Rico
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Pregnancy Trimester, First
History, 21st Century
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Sex Factors
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Urban Health Services
CD4 Lymphocyte Count
Nonverbal Communication
Pneumococcal Vaccines
Amphetamines
Anti-HIV Agents
Bacterial Vaccines
Amphetamine
CD4-Positive T-Lymphocytes