1. Characteristics of Americans With Primary Care and Changes Over Time, 2002-2015
2. WHO (2018) Primary Care. https://www.who.int/teams/integrated-health-services/clinical-services-and-systems/primary-care
3. World Health Organization (1978) Primary Health Care: Report of the International Conference on Primary Health Care, Alma-Ata, USSR. World Health Organization, Geneva
4. United Nations (2015) Transforming Our World: The 2030 Agenda for Sustainable Development.https://sustainabledevelopment.un.org/post2015/transformingourworld/publication
5. Making the Case for the Benefits of Primary Care From Observational Studies: Does an Ounce of Prevention Take a Pound of Doctor Visits?