1. US Census Bureau. Percent distribution of the projected population by selected age groups and sex for the United States: 2010 to 2050. Population Division 2008.
http://www.census.gov/population/www/projections/summarytables.html
. Accessed 22 November 2012.
2. Anderson G. Chronic care: making the case for ongoing care. Robert Wood Johnson Foundation, Princeton, NJ.
http://www.rwjf.org/files/research/50968chronic.care.chartbook.pdf
. Accessed 21 November 2012.
3. Gu Q, Dillon CF, Burt VL. Prescription drug use continues to increase: U.S. prescription drug data for 2007–2008. NCHS Data Brief 2010.
http://www.cdc.gov/nchs/data/databriefs/db42.pdf
. Accessed 22 November 2012.
4. Cramer JA, Roy A, Burrell A, et al. Medication compliance and persistence: terminology and definitions. Value Health. 2008;11(1):44–7.
5. Sabaté E. Adherence to long-term therapies: evidence for action. 2003.
http://apps.who.int/medicinedocs/pdf/s4883e/s4883e.pdf
. Accessed 20 November 2012.