AP

Shares of Merck fell 77 cents, or 2.6 percent, to $28.91 in early trading on the New York Stock Exchange.

Authors of a study funded by Vioxx maker Merck & Co. failed to disclose in a report published in the New England Journal of Medicine in 2000 that three additional patients in a clinical study suffered heart attacks while using the now-withdrawn painkiller, the journal wrote in an editorial released Thursday.

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