For four years, a sophisticated group of Chinese cyberspies has cut a digital swath through the health-care industry, stealing everything from trade secrets to trial data, say security firms probing the campaign. The group infiltrated one U.S. In other cases, the hackers accessed pharmaceutical labs through their connections with university researchers, scooping up trial data and other trade secrets, said Aaron Shelmire, a threat researcher for Dell SecureWorks. A newly reported theft of personal data from 4.5 million patients served by Community Health Systems Inc., the second biggest U.S.