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- http://rheumatology.medscape.com/MedscapeWire/2000/0600/medwire.0613.One.html Medscape Wire. June 13, 2000. One of every four americans has a musculoskeletal condition
- http://www.paineurope.com/index.php?q=en/book_page/pain_in_europe_survey/2000/0600/medwire.0613.One.html
- http://www.painfoundation.org