1. Vincent GK, Velkoff VA. The next four decades: the older population in the United States: 2010 to 2050. Available at: http://www.census.gov/prod/2010pubs/p25-1138.pdf (accessed January 8, 2015).
2. US Census Bureau. 2010 census data. Available at: http://www.census.gov/2010census/data/ (accessed January 8, 2015).
3. Physician workforce projections in an era of health care reform;Kirch;Annu Rev Med,2012
4. Institute of Medicine. The future of nursing: leading change, advancing health. Available at: http://www.thefutureofnursing.org/sites/default/files/Future%20of%20Nursing%20Report_0.pdf (accessed July 9, 2015).
5. Future supply and demand of oncologists;Erikson;JOP,2007