A shopper looks at the vitamin selection at a Walgreen's dru [Getty Images]

UNITED STATES - MARCH 22: A shopper looks at the vitamin selection at a Walgreen's drug store in New York, March 22, 2004. Shares of Walgreen Co., the largest U.S. drugstore chain, fell as much as 4.5 percent after the retailer said second-quarter profit excluding a one-time gain rose less than analysts expected. (Photo by Jennifer S. Altman/Bloomberg via Getty Images)

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