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NEW YORK (Reuters) - Merck & Co. Inc. on Tuesday said U.S. regulators have approved its combination vaccine to protect children 12 months to 12 years of age against measles, mumps, rubella and chickenpox. The vaccine, called Proquad, which combines two established Merck vaccines, is the first approved in the United States to target all four diseases in a single shot, Merck said. It is also approved for use as a second dose of measles, mumps and rubella vaccine. "The approval of...