1. Agency for Healthcare Research and Quality. 2007. CAHPS Health Literacy Item Set. http://www.cahps.ahrq.gov/content/products/HL/PROD_HL_Intro.asp, accessed 15 October 2015.
2. Diet and Lifestyle Recommendations Revision 2006
3. Apráez Ippolito G Sarmiento Limas C. 2014. Research Needs on Primary Health Care in Colombia in the Post-Conflict era. Canadian Medical Association Journal Blogs November 23. http://cmajblogs.com/research-needs-on-primary-care-health-in-colombia-in-the-post-conflict-era/, accessed10 January 2015.
4. Alternatives for logistic regression in cross-sectional studies: an empirical comparison of models that directly estimate the prevalence ratio
5. Berry D. 2007. Health Communication: Theory and Practice. Maidenhead, Berkshire, England: Open University Press.