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United States
Referral and Consultation
Questionnaires
Physician's Practice Patterns
Health Status
Specialization
Health Status Indicators
Health Services Accessibility
Reproducibility of Results
Prospective Studies
Primary Health Care
Gatekeeping
Health Care Surveys
Child Health Services
Managed Care Programs
Office Visits
Medicine
Pediatrics
Infants
Newborn Infant
Co-Publications
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15
7
6
5
4
3
2
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