1. The American Academy of Pain MedicineAAPM Facts and Figures on Pain, The Burden of Pain on Every Day Lifehttp://www.painmed.org/patient/facts.html#burden63DcQKtMw
2. Centers for Disease Control and Prevention2011-11-15Chronic Diseases and Health Promotionhttp://www.cdc.gov/chronicdisease/overview/index.htm63DaRar6S
3. Narrative Medicine