Quality Control Flaws Cited at Boston Scientific

Boston Scientific Corp., the largest maker of cardiac stents for the U.S. market, said it received a warning letter from regulators citing flaws in quality management at six facilities.

The Food and Drug Administration said it wouldn’t approve some life-sustaining products made at the cited plants until the problems were corrected, the Natick, Mass.-based company said. The FDA also said it wouldn’t issue export licenses for the affected products.