Silver Book Fact
Most people with persistent pain have multiple sites of pain.
Croft P, Blyth F, Van der Windt D. The Global Occurrence of Chronic Pain: An Introduction. In Chronic Pain Epidemiology: From aetiology to public health. New York, NY: Oxford University Press; 2010. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199235766.001.0001/acprof-9780199235766-chapter-002