Rosenthal E. The $2.7 trillion medical bill. Colonoscopies explain why U.S. leads the world in health expenditures. The New York Times 01.06.2013; Available from: http://www.nytimes.com/2013/06/02/health/colonoscopies-explain-why-us-leads-the-world-in-health-expenditures.html?pagewanted=all&_r=1& Accessed 27: July 27 2013
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