Bottles of the Coca-Cola company’s Vitaminwater drinks are arranged for a photo Wednesday, June 11, 2014 in Boston. Fans of Vitaminwater are demanding that Coca-Cola drop a new formula from its full-calorie version that uses stevia, a low-calorie sweetener known for its metallic aftertaste. Coca-Cola already used stevia in Vitaminwater Zero, a diet version of the drink that has no calories. (AP Photo/Stephan Savoia)

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