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Influenza Vaccines
Pneumococcal Vaccines
Vaccination
Immunization Programs
Urban Health Services
Immunization
Health Care Surveys
Primary Health Care
Human Influenza
Pneumococcal Infections
Pennsylvania
United States
Questionnaires
Health Knowledge, Attitudes, Practice
Patient Acceptance of Health Care
Logistic Models
Urban Population
Socioeconomic Factors
Community Health Centers
African Americans
Co-Publications
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