Boston Scientific Corp. and Johnson & Johnson are losing sales of drug-coated heart stents because doctors are concerned the devices raise the risk of blood clots. Doctors have used stents, tiny mesh tubes, to prop open diseased heart blood vessels in 4 million people worldwide since 2001.
Ridding the world of polio, a contagious disease that can cause paralysis, depends on the effectiveness of Afghanistan, India, Nigeria and Pakistan in vaccinating children, the World Health Organization said.
U.S. health regulators said Thursday they found no evidence that silicone breast implant maker Mentor Corp. committed any wrongdoing after examining a former employee's allegations that the company withheld safety data.
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