1. Ortman JM, Velkoff VA, Hogan H. An aging nation: the older population in the United States. Updated 2014. https://www.census.gov/prod/2014pubs/p25-1140.pdf. Accessed 9 May 2018.
2. Alzheimer disease in the United States (2010–2050) estimated using the 2010 census;Hebert;Neurology,2013
3. Vincent GK, Velkoff VA. The Next Four Decades: The Older Population in the United States: 2010 to 2050. No. 1138. US Department of Commerce, Economics and Statistics Administration, US Census Bureau. Updated 2010. https://www.census.gov/prod/2010pubs/p25-1138.pdf. Accessed 9 May 2018.
4. Parkinson's disease as a system-level disorder;Caligiore;NPJ Parkinsons Dis,2016
5. Management of the hospitalized patient with Parkinson's disease: current state of the field and need for guidelines;Aminoff;Parkinsonism Relat Disord,2011