1. The obstetrician-gynecologists workforce in the United States: facts, figures, and implications 2nd edition;Rayburn,2017
2. The complexities of physician supply and demand: projections through 2025;Dill,2008
3. 2016 update. The complexities of physician supply and demand: projections from 2014 to 2025. Final report,2016
4. Table 3-1 Percent distribution of the projected population by selected age groups and sex for the United States: 2015 to 2060 (NP2012-T3L U.S. Census Bureau, Population Division). Available at: https://www.2census.gov/programs-surveys/popest/. Accessed on September 28, 2016.
5. Births in the United States, 2015. NCHS data brief, no 258;Martin,2016