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http://www.who.int/ncds/en/
2. Canadian Institute for Health Information20112018-06-13Seniors and the health care system: what is the impact of multiple chronic conditions?
https://secure.cihi.ca/free_products/air-chronic_disease_aib_en.pdf
3. SinhaMStatistics Canada20132018-06-13Spotlight on Canadians: Results from the General Social Survey, Portrait of caregivers, 2012
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4. National Alliance for Caregiving and the AARP20042018-06-13Caregiving in the US
http://www.caregiving.org/data/04finalreport.pdf