Lipitor And Crestor, Best Selling Cholesterol Drugs [Getty Images]

Cholesterol drugs, Crestor, left, manufactured by AstraZeneca Plc, and Lipitor, manufactured by Pfizer Inc., are arranged for a photrograph at New London Pharmacy in New York, U.S., on Tuesday, April 6, 2010. Best-selling heart drugs Lipitor and Crestor lower production of so-called bad cholesterol, or LDL, by blocking an enzyme in the liver. Photographer: JB Reed/Bloomberg via Getty Images

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