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3. Department of Health, Social Services and Public Safety, Northern Ireland Government. Living with Long Term Conditions; April 2012 [cited on 22 November 2013]. Available from: http://www.dhsspsni.gov.uk/long-term-condition.htm
4. Centers for Disease Control and Prevention. Chronic Diseases and Health Promotion; 2013 [updated on 13 August 2012; cited on 9 December 2013]. Available from: http://www.cdc.gov/chronicdisease/overview/index.htm
5. Retinal Vascular Signs: A Window to the Heart?;G Liew;Revista Española de Cardiología (English Edition),2011