Abdominal muscles. Better Health Channel website. Available at:
http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Abdominal%5Fmuscles?open. Updated January 9, 2013. Accessed April 26, 2013.
Sprains, strains, and tears. American College of Sports Medicine website. Available at:
http://www.acsm.org/docs/brochures/sprains-strains-and-tears.pdf. Accessed April 26, 2013.
10/26/2010 DynaMed's Systematic Literature Surveillance
http://www.ebscohost.com/dynamed/what.php: Massey T, Derry S, Moore R, McQuay H. Topical NSAIDs for acute pain in adults.
Cochrane Database Syst Rev.